Ergonomically designed to fit small to large hand sizes.perfect for men,women,seniors and teens. 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 easily adjustable dial and 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 d mers as well as guitar,piano and violin players. Color: black and blue Material: ABS Size about: 10.5*15cm Package Contents: 1*Hand Dynamometer Grip Only the above package content, other products are not included. Note: Light shooting 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. Note: 1. Please allow 1-3 mm error due to manual measurement and 1-3g weight error make sure you don't mind before ordering. 2. Due to the lighting of the photos and the difference of monitors, the pictures may not reflect the actual color of the real item. Please make sure you don't mind before ordering, thank you! About Shipping: 1.please pay attention to your delivery address such as: name, street, house number, doorbell/email without name, etc. is correct, or the order will not be delivered correctly. 2.All items will be shipped within 3 business days after the payment is received. Most times you will receive them within 8-12 days then. The specific delivery time is depend on circumstances. 3.During the shopping process, if you have any questions, please feel free to consult us, we will reply you within 24 hours Hope you have a pleasant shopping experience!