SuperGrips are a special silicon formula designed to last a long time even on rough surfaces like asphalt, but give a non-slip grip to carpet, hardwood or vinyl floors; or countertops and glass surfaces. These skid grips are made to fit SuperSkids, but also fit Align and other brand landing skids. These are small and lightweight, but they really grip and they look great. One package includes 4 blue, 4 yellow and 4 black grips. If you like hopping from coffee tables to countertops, you need SuperGrips.