Freezing tubes?Place of Origin: China (Mainland) Keyword: Cryo tube Material: PolypropyleneVolume: 1.5ml~5ml Cap: connecting screw cap Bottom: Self-standingTube color: Natural/Brown Tube length:?Bottom diameter:Certificate: CE, ISOvarious types cryo tubes, including conical bottom, self-standing bottom and flat bottom, volume with 0.5ml, 1ml, 1.5ml, 1.8ml, 5ml.Product Features:1. Screw cap with silicone "O" ring for a positive and leak-proof seal.2. Perfect autoclavable and freezable3. Graduated in 1, 2, 3 , 4, 5ml4. Big white writing area provied easy marking http://www.kangjia-bottles.com/...-250ml-500ml-1000ml.html