{"product_id":"5-key-adjustable-finger-strengthener-solid-brass-core-3-8-5-lb-guitar-piano-rehab-stress-relief","title":"5-Key Adjustable Finger Strengthener | Solid Brass Core 3–8.5 lb | Guitar Piano Rehab Stress Relief","description":"\u003ch2\u003eAbout This Item\u003c\/h2\u003e\n\u003cp\u003eFive keys. Five fingers. One precision brass mechanism per key, individually adjustable from 3 to 8.5 pounds of resistance. Press, release, repeat. The MFX5 finger strengthener is the most mechanically sophisticated finger trainer available—a full-brass internal mechanism in each of the five keys, a flat palm-rest design that keeps your hand in the correct playing position, and soft-pull keycaps with three raised contact points that allow wide finger-span practice without restriction. For guitarists, pianists, climbers, typists, and anyone who wants stronger, more independent fingers.\u003c\/p\u003e\n\u003cdiv style=\"background: #fafafa; padding: 20px; border-left: 4px solid #8b7355; margin: 20px 0; border-radius: 4px;\"\u003e\n\u003ch3 style=\"margin-top: 0;\"\u003ePersonalization\u003c\/h3\u003e\n\u003cp style=\"margin: 0;\"\u003eCustom engraving is not available for this product.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #fafafa; padding: 20px; margin: 20px 0; border-radius: 4px;\"\u003e\n\u003ch3 style=\"margin-top: 0;\"\u003e✨ Key Features\u003c\/h3\u003e\n\u003cul style=\"margin-bottom: 0;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eFull Brass Core Mechanism (Per Key):\u003c\/strong\u003e Each of the five keys contains a precision-machined solid brass spring mechanism—not plastic, not steel wire. The brass core provides smooth, consistent resistance with zero play or rattle. The knurled brass adjustment dial at the base of each key is turned clockwise to increase resistance and counterclockwise to decrease it—a simple, precise, and completely tool-free adjustment system.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIndividually Adjustable Resistance (3–8.5 lbs per key):\u003c\/strong\u003e Each key is independently adjustable across the full 3–8.5 lb \/ 1.4–3.9 kg range—set each finger to its own resistance level to target weaker fingers specifically, or set all five to the same level for uniform training. The adjustment range covers beginner through advanced training needs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInnovative 5-Key Design:\u003c\/strong\u003e The fifth key—the thumb key—is the defining feature of the MFX5. Most finger trainers have four keys (index through pinky). The MFX5 adds a dedicated thumb key, enabling thumb independence training, chord-grip simulation, and a wider range of exercises than any 4-key trainer can provide.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide Finger-Span Keycaps:\u003c\/strong\u003e The soft-pull keycaps feature three raised contact points and a flat, wide surface—designed to allow wide finger-span practice (stretching between keys) without the keycap edge cutting into the fingertip. Practice large chord stretches and wide interval patterns without discomfort.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlat Palm-Rest Design:\u003c\/strong\u003e The flat, ergonomic palm rest keeps your hand in the correct playing position during training—wrist neutral, fingers curved, palm supported. The non-slip silicone base prevents the trainer from sliding during use.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePremium Non-Slip Silicone Base:\u003c\/strong\u003e The orange silicone base provides a secure grip on any surface—desk, table, or lap. The silicone is soft enough to be comfortable against the palm during extended training sessions.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003ch3 style=\"margin-top: 30px;\"\u003e🎸 Perfect For\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eGuitarists \u0026amp; Bassists:\u003c\/strong\u003e Build finger independence, chord-grip strength, and fret-hand endurance. The 5-key design enables thumb training for thumb-over-the-neck techniques.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePianists \u0026amp; Keyboard Players:\u003c\/strong\u003e Develop finger independence and even key-strike force across all five fingers—the individually adjustable resistance targets weaker fingers specifically.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClimbers \u0026amp; Grip Athletes:\u003c\/strong\u003e Build finger flexor strength and tendon resilience with controlled, progressive resistance training.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRehabilitation \u0026amp; Recovery:\u003c\/strong\u003e Gentle, controlled finger exercise for post-injury rehabilitation, arthritis management, and fine motor skill recovery. The 3 lb minimum resistance is appropriate for early-stage rehabilitation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDesk Stress Relief:\u003c\/strong\u003e Five satisfying brass-core keys to press, one at a time or all together—a genuinely effective stress relief tool that also builds finger strength.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv style=\"background: #fff8e1; padding: 20px; border-left: 4px solid #e8a000; margin: 20px 0; border-radius: 4px;\"\u003e\n\u003ch3 style=\"margin-top: 0;\"\u003e⚙️ Resistance Adjustment Guide\u003c\/h3\u003e\n\u003cp style=\"margin: 0;\"\u003e\u003cstrong\u003eTo increase resistance:\u003c\/strong\u003e Turn the brass knurled dial at the base of each key clockwise.\u003cbr\u003e\u003cstrong\u003eTo decrease resistance:\u003c\/strong\u003e Turn the brass knurled dial counterclockwise.\u003cbr\u003eEach key is adjusted independently. Start at the lowest resistance setting and increase gradually over weeks of training to avoid finger strain or injury.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #fafafa; padding: 20px; margin: 20px 0; border-radius: 4px;\"\u003e\n\u003ch3 style=\"margin-top: 0;\"\u003e📐 Specifications\u003c\/h3\u003e\n\u003cul style=\"margin-bottom: 0;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eKeys:\u003c\/strong\u003e 5 (index, middle, ring, pinky + thumb)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCore Material:\u003c\/strong\u003e Solid brass (per key mechanism)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBase Material:\u003c\/strong\u003e Premium non-slip silicone\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 66mm × 105mm × 22mm \/ 2.6\" × 4.1\" × 0.9\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResistance Range:\u003c\/strong\u003e 3–8.5 lbs \/ 1.4–3.9 kg per key (individually adjustable)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdjustment:\u003c\/strong\u003e Knurled brass dial (clockwise = more, counterclockwise = less)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e Orange \/ Gray\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSuitable For:\u003c\/strong\u003e All users — beginner through advanced\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUse:\u003c\/strong\u003e Finger strength training \/ guitar \u0026amp; piano practice \/ climbing \/ rehabilitation \/ stress relief\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cem\u003eOrder now and build the finger strength your playing deserves—one key at a time! 🎸✨\u003c\/em\u003e\u003c\/p\u003e","brand":"Lightyear24","offers":[{"title":"Grey","offer_id":51377683824804,"sku":null,"price":44.99,"currency_code":"USD","in_stock":true},{"title":"Yellow","offer_id":51377683857572,"sku":null,"price":44.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0576\/3927\/2612\/files\/5-KeyAdjustableFingerStrengthenerSolidBrassCore3_8.5lbGuitarPianoRehabStressRelief_2.jpg?v=1781087699","url":"https:\/\/www.lightyear24.com\/products\/5-key-adjustable-finger-strengthener-solid-brass-core-3-8-5-lb-guitar-piano-rehab-stress-relief","provider":"Lightyear24","version":"1.0","type":"link"}