Bitray Finger Strengthener,Hand Grip Strength Trainer with Round Keys for Guitar Beginner Exercier,Adjustable Finger Strengthener Exerciser Guitar Training Tools(3.54x2.76x0.98inch)

Specifications: Material: ABS Plastic + Silicone Color : Black Size: Approx. 9 x 7 x 2.5cm / 3.54 x 2.76 x 0.98in Round Key：1.6cm/0.63 inch Weight: Approx. 54.5g Package List: 1 x Finger Exerciser Feature: 1.Soft button cap makes it comfortable to press.The slim size makes you hold it all in one palm. 2.The base and top buttons are made of eco-friendly silicone with non-slip design. 3.Applicable to many instruments, piano, guitar, etc. 4.Extremely portable design, you can carry it in your luggage, pocket, purse, handbag etc.,strength your fingers at any time when you want.Callus Builder Ideal for all sports, especially for all types of climbing, gymnastics, body building/fitness, as well as for industrial, fire/rescue, logging, etc. Adjustable Tension Adjustable tension that is customizable for each individual finger. Ergonomic Grip Reversible molded grip uncovers simulated strings to help develop and maintain finger calluses for string musicians.