[Material] Caps are made of polypropylene; Can be repeatedly frozen and thawed
[Screw Thread Design] Universal screw threads for use
[Working Temperature] These screw caps are autoclavable to 121℃ and freezable to -86℃
[What You Get] Caps only, vials sold separately
[Excellent Customer Service] We are dedicated in providing the best products and services to customers. If you have any problem, please feel free to contact us. We will help you solve the problem as soon as possible