FENDER Patented Callus Builder & Finger Strengthener – Resistance Finger Exerciser for Guitar, Bass & Violin – Guitar Finger Trainer & Grip Strength Tool – Ideal Guitar & Bass Accessories (Tensions: RED=8-Lbs; BLACK=15-Lbs)

About this item

• ESSENTIAL GUITAR & BASS ACCESSORY – From beginners to pros, this must-have guitar finger trainer improves strength, coordination, and endurance—perfect for daily guitar training or warm-ups before a performance.
• LICENSED and PATENTED FENDER CALLUS BUILDER – Designed in the shape of Fender’s iconic Stratocaster, this officially licensed guitar callus builder is a standout in any collection of guitar & bass accessories.
• RAISED STRING-LIKE RIDGES – Unlike typical strength training grip strengtheners, this exclusive patented design includes raised ridges that simulate real string tension to help build calluses—ideal for realistic guitar finger exerciser practice.
• MIRRORS PLAYING POSITION – Ergonomically shaped to replicate your hand and finger angles while playing any stringed instrument, making it a versatile tool to build calluses where you need them.
• HIGHEST TENSION AVAILABLE – Included both 8-lb (RED) or 15-lb (BLACK) resistance. The BLACK version delivers extreme resistance—unmatched by any other guitar finger trainer or hand exerciser on the market.
• PERFECT HOLIDAY GIFT & STOCKING STUFFER – A thoughtful holiday gift that shows you support their musical journey. The ideal add-on for anyone receiving a new guitar! Compact, affordable, and fun to use — musicians of all ages LOVE this in their stocking.