●[Material ] Made of medical grade polypropylene; Can be repeatedly frozen and thawed ●[Screw Threads Design] Universal screw threads for use. ●[Working Temperature] Autoclavable to 121℃ and freezable to -86℃. ●[What You Get] Caps only, tubes will be 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.