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20mm Aluminium Flip off Seal with for Injection Glass Vials. Customizable Aluminum Color: Specific colors for aluminum parts can be customized according to client requirements. Cleanroom Production: Caps are produced in a 6500 m2 cleanroom with pure water washing and ultrasonic cleaning. Quality Assurance System: Full inspection via automatic electric image test equipment and sampling tests before delivery. ISO Certified Manufacturer: Certified with ISO9001, ISO4001, and OHSAS18001 with over 20 years of production experience. Fast Delivery Time: Standard delivery within 7 days after receiving payment for stocked items. Free Sample Service: Free samples are provided for quality evaluation and technical consultation.