Applicable Scenes: Ergonomically designed to fit small to large hand sizes. perfect for men, women, seniors and teens. 42mm diameter round, entity pointer display, clear scale, auto zero. Design for athletes and sports enthusiasts who want to increase their hand, wrist, forearem and finger strength for rock climbing, , bodybuilding, golf, tennis etc. Great hand strengthener for musicians including drummers as well as guitar, piano and violin players. High Wear- and excellent durability. size: 165 x 75 x 24mm Material: ABS colour: blue+black Package Contents: 1 x Grip strength trainer Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. 42mm diameter round, entity pointer display, clear scale, auto zero. Great hand strengthener for musicians including drummers as well as guitar, piano and violin players. Design for athletes and sports enthusiasts who want to increase their hand, wrist, forearem and finger strength for rock climbing, , bodybuilding, golf, tennis etc. Applicable Scenes: Ergonomically designed to fit small to large hand sizes. perfect for men, women, seniors and teens. High Wear- and excellent durability.