The Everlast 2.5lb (1.13kg) wrist & ankle weights will increase the efficiency of your cardiovascular workouts & let you perform specific exercises to tone & strengthen a number of muscles including the biceps, triceps, thighs & quads. There is a thumb loop for added lifting support when used on your wrists, & the double grip strip & contoured shape ensure a secure fit. The weights are supplied in a pair & are one size fits most.