Glass Syringe Reusable with Metal Luer Lock (Case of 2) (2ml) The syringes are made from heat resistant borosilicate resistance glass. The material and construction is resistant to breakage from shock and sudden temperature changes. Barrel rim is flat on both sides to prevent rolling and is wide enough for convenient finger tip grip. It is annealed and tested until free of internal strain, to withstand repeated washing with hot water. Made In India.