Description: Screw Cap Microcentrifuge Tubes available in three sizes: 0.5, 1.5, and 2.0ml. Polypropylene tubes and caps are autoclavable . Designed to withstand temperatures from -196 to 121C and RCF 20,000 x G. Available in conical bottom or free-standing. Lock-ribbed caps for one-handed opening and closing.500/pack.