Colour Rubber Stopper For Blood Collection Tube（no cap） https://www.klstopper.com/product/medical-rubber-products-series/colour-rubber-stopper-for-blood-collection-tube-no-cap.html Special surface treatment technology eliminates the effects of silicon treatments on blood products . The most stringent process control ensures the cleanliness of the rubber stopper . Suitable acupuncture resistance，Can withstand 60000 times of acupuncture abrasion Excellent γ-ray resistance Specification Crown Thick Crwon Dia Neck Dia Height 11.6-K 6.7 ± 0.2 16.7 ± 0.2 11.6± 0.1 15.7 ± 0.3 E-MAIL: mindy@tzkljs.com