Specification: 
Name: Finger Mark Silicone Grip Ring
Material: silicone
Product weight: about 65-70g
Diameter(approx.): 7.5CM/2.95inch (manual measurement, the tolerance is inevitable)
Hardness:
Green 20LB (suitable for elderly or rehabilitation use)
Blue 40LB (suitable for ladies or men with less power)
Orange 60LB (suitable for men's use)
Purple 80LB (suitable for men's use)
Gray 100LB (suitable for older men with greater strength) 

Packing List:
1*Hand Grip