Ginnasta USA Power Double Buckle Gymnastics Grips - Ladies Uneven Bars Break-in period for Ginnasta USA grips is approximately 30 minutes! Our leather won't stretch. Buy the correct size and it stays that size. Velcro, Single Buckle, or Double Buckle. Leather stays supple with use, never brittle or hard. You can even use water, and wire brushing. Dowel stitching is machine sewn with thread that is double the weight of industry standards.