Description: <p>[Premium Quality]The hand exercise gripping rings are made from premium silicone,suitable for Gripper,stretch,and pull.The nonslip rings are also torn and crack resistant for long term use.</p><p>[Perfect Size]Outer diameter 7.7cm/3.03inch, Inner diameter 3.8cm/1.50inch,Thickness 2.1cm/0.83inch,Perfectly sized for grip strength training for men,women,seniors,and teens.The muscle training rings offer resistance and fill your hand.</p><p>[Grip Strengthener]Strengthen wrists,improve the dexterity of your fingers and increase the strength your hands can apply while reducing fatigue.The hand gripper helps balance your grip muscles and your expanding muscles.</p><p>[Easy to Carry]Suitable for all age groups and fits well for all hand sizes.Portable compact design,hand gripper is convenient for training fingers,hands and forearms throughout the day at home,office,watching tv,rest,etc.</p><p>[Widely Used]Ideal for athletes(tennis,basketball,boxing,golf,and rock climbing)and musician (guitar players,bass players,pianists,and violinists),computer workers.great gift choice for families,friends,colleagues,etc.</p> Specification: Size_Chart: <p>Outer diameter 7.7cm/3.03inch</p><p>Inner diameter 3.8cm/1.50inch</p><p>Thickness 2.1cm/0.83inch</p> Note: <p>Please allow slightly errors due to manual measurement and different monitors.</p> Package_Includes: <p>1 Hand Grip Exerciser</p>