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Butyl Rubber Stoppers 20mm Grey Color for Powder Injection Use. Pharma Grade Material: Made of high-quality butyl rubber suitable for pharmaceutical applications. Sterilization Available: Can provide ethylene oxide sterilization service upon request. Fast Delivery: Standard delivery time is within 10 days from order confirmation. Free Samples: Free samples available for testing; buyer covers courier cost. Flexible Packaging: Standard carton packing; carton plus pallet packing also available.