Secure lid closure with the MULTICAP TOOL Cat. #5050-15 assisting in the closing and opening and prevents aerosolizing. 0.5 mL Frosted Flat Cap surface for sample inscription. Tubes fabricated from virgin polypropylene. Highly polished inner surface allows for maximum sample recovery. Tubes are autoclavable at 121 degrees C 15 PSI for 15 minutes - Remove tubes from autoclave immediately. Color: - Red.