13mm and 20mm sterile vial stoppers from Voigt Global Distribution Inc. Pre-washed, gamma-irradiated sterile vial stoppers are available from Voigt Global Distribution Inc in convenient bags of 1,000 pieces. Manufactured by an FDA – DMF registered facility and tested in the USA for compliance with USP Sterility Testing and Endotoxin standards. Irradiation procesing and production lot traceability labelling is each double bagged 1,000 piece sale unit. See: https://voigtglobal.com/237-sterile-vial-stoppers