Vinyl covering makes them easy to grip and they don't chip or damage floors. Perfect for group and rehab training sessions. Sold in pairs, color coded by weight. 1 lb. - pink, 2 lb. - Violet, 3 lb. - forest green, 4 lb. - sky Blue, 5 lb. - navy Blue, 6 lb. - Red, 7 lb. - Purple, 8 lb. - black, 9 lb. - Yellow, 10 lb. - orange, 12 lb. - Purple, 15 lb. - black.