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Collars are easy and quick way to move your plates around. They also keep weight plates securely and safely while lifting. for long lasting use. 100% brand new and high quality. Easy and Quick to remove,Safe and Secure to provide balance and stability Card grooves are random, and random colors cannot be selected Best for chest and arm exercises. colour:black Material:plastic size:25mm Package Contents: 1* pair Dumbbell Hex NutOnly the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.