★★★High Quality Materials : Lab sample vials are made of high quality borosilicate glass,thick, strong, low coefficients of thermal expansion, thermal shock resistance, high chemical resistance in aggressive environments. And equipped with burr-free flip off cap,ensure it without tears the metal cover after lifting off cap. ★★★Pre-Sterilization Vials : The empty vials are sterile. They are produced and sterilized by aseptic workshop,can be used directly. And the bag with sterilization indicator shows the completion of sterilization. ★★★Leakproof Design: Double leakage design,each glass bottle is equipped with self healing injection port rubber stopper in plastics aluminum cover and sealing by specialized machines .High quality rubber stopper make sure it can be use several times but no leak. ★★★With Easy-Open Ring : Glass vials with easy-open ring,can be easy removed the aluminum covers by the pull ring without any opener if needed.It with secure design to make sure you don't get hurt when you use the round ring. ★★★Widely Use : Sterile empty vials are used to store the items that require sterile conditions, such as some kinds of chemical materials. Good for students to practise, use in laboratory,and convenient storage. Vial Color : Clear/Amber Vial Size: 22*35mm (5ml) ; 22*50mm (10ml)