Specifications: Material:The tube is made of PET plastic and the cap is made of aluminum. Color:Clear. Size:150 mm/5.9 inch in length and 34 mm/1.34 inch in diameter(115ml). Package included: 24 plastic flat-bottomed test tubes with aluminum caps. Features: 1.Our tubes are reusable,so once you clean them,you can fill them with whatever you want--candy,food,liquid and so on. 2.Our test tube can be filled with hot liquid like hot cocoa,but do not expose it to too high a temperature,which will distort it and make it unusable. 3.The PET material prevents the test tube from shattering like glass,making it easier to store and transport.