Shaoxing ALWSCI Technologies Co.,Ltd is one of the leading China test tube manufacturers and suppliers,Website:://.alwsci.com, welcome to wholesale cheap test tube from us. FEATURES1.ALWSCI Glass Culture and Test Tubes have enamel marking spot. Screw thread test tubes include PP caps and autoclavable phenolic caps with PTFE/Silicone septa.2.Tubes are made from Borosilicate tubing, with a fire-polished top rim and uniform wall thickness for maximum heat transfer and chemical resistance.