Axygen polypropylene, thin wall PCR tubes with and without caps are designed to fit standard 96-well blocks and are available in an assortment of colors. The consistent and ultra-thin wall allows precise thermal transfer. An even insertion cap ensures a tight fit to reduce evaporation. Axygen polypropylene, thin wall PCR tubes with and without caps are designed to fit standard 96-well blocks and are available in an assortment of colors. The consistent and ultra-thin wall allows precise thermal transfer. An even insertion cap ensures a tight fit to reduce evaporation.