Cap, Diameter 33 mm, Screw Closure Size 33-430 mm, Closure Material Polypropylene, Product Type Screw On Cap, Closure Color Black, Closure Liner Material Polypropylene/Silicone/PTFE, Closure Type Screw On, Autoclavable Yes, Special Features Low-Compression-Set Silicone Ideal For Storage of Samples For Prolonged Periods of Time Over Wide Temperature Ranges, Closure Liner Design Open Top, Package Quantity 50