Description: Product Material: iron Size: diameter 50mm How to use: When exercising, put two balls in your hand, relying on five fingers flexion and extension, so that the two balls circled with each other, the rotation direction of Shun, inverse of the points, so that all the joints in the hand are in motion. With the hand flexion and extension, exhibition income, front wall muscles can have a rhythm of contraction and relaxation. Hands can be alternating exercise, but also three or four balls at the same time rotating, playing a few tricks! Package Include:A pair of balls, a ball holder, a gift box and a tote
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