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, shooting, bodybuilding, golf, tennis etc. The wide range of tensions make the hand exerciser a popular choice for those with arthritis, rheumatoid arthritis, tendonitis, carpal tunnel, tennis elbow and those recovering from a Broken wrist and tendon surgery. Great hand strengthener for musicians including drummers as well as guitar, piano and violin players., Manufacturer: CFWWSAQ