Axygen® 0.2 mL polypropylene thin wall PCR tubes with flat caps are designed to fit standard 96 well blocks and are available in an assortment of colors. Ultra-thin and consistent wall thickness allows precise thermal transfer and even insertion cap ensures a tight fit to prevent evaporation. Axygen® 0.2 mL polypropylene thin wall PCR tubes with flat caps are designed to fit standard 96 well blocks and are available in an assortment of colors. Ultra-thin and consistent wall thickness allows precise thermal transfer and even insertion cap ensures a tight fit to prevent evaporation.