Dynarex LabChoice Flex Caps for Test Tubes are precision-molded from high-quality polyethylene for optimal durability. These flexible snap-on Caps offer a tight seal and comfortable grip, reducing the risk of spills and minimizing evaporation during storage and transport. The Caps are designed to withstand a variety of laboratory conditions, including centrifugation, agitation, refrigeration, and freezing. The Flex Caps are designed with a thumb tab for easy removal. Dynarex LabChoice Flex Caps can be labeled with ink for quick identification.  1000 PER BAG, 10 BAGS PER CASE