Packaging & Delivery Packaging Details: 500*28pcs per carton Delivery Detail: About 2 weeks after receive your payment Product Description Product Name : Disposable Laboratory Graduated Flat bottom Freezing Tube Cryotube Feature: 1.Made of high quality PP  2.Cover with silica gels sealing ring which can prevent leakage 3.Can be used under temperature of -70 Celsius degree 4.OEM accepted if ultra-low temperarature under liquid nitrogen -196 Celsius Degree is requiredCryovial tubes are refrigerated and frozen. The tube wall is siliconized with uniformed thickness, high transparency, safe, convenient and clean which canbe used for the Lab Microscale and Analysis.