8-425 Screw-Thread Caps provided by STE-Mart are made of polypropylene.
Specification
Material: USP Type 1 borosilicate glass Total volume: 2.0 mL Recommended fill: 1.5 mL Dimensions: 11.6*32 mm Openings: 8-425 screw top Bottom style: flat bottom Description: Black polypropylene screw caps with pre-slit blue PTFE/white silicone septa, 5.5mm hole Qty.: 100/PK