Team Express Grip Strengthening Exercise Balls Exercise ball helps develop strength and power in fingers, hand, wrist and forearm. Strengthen your grip in just 10 minutes a day. Specify weight. Each weight sold individually. Blue - 4 oz. (Step 1 of 3 in Strengthening System) Red - 16 oz. (Step 2 or 3 in Strengthening System) Black - 32 oz. (Step 3 in Strengthening System)
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