Cap Diameter 38 mm Screw Closure Size 38-430 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