http://www.yulimedical.com/blo....od-collection-tube/v Vacuum Blood Collection Tube Product Introduction No additive tube is used in blood collection and storage for biochemistry, immunology, serology, tests of various kinds of virus , microelement and blood preparation in medical inspection. It can maintain the normal compositions of serum for a long time. Moreover, it's helpful to reinspect serum with good repeatability. Parameter Properties: Blood Collection and Storage Brand Name: YULI or OEM Brand Material: Glass or plastic Size: 13*75mm / 13*100mm / 16*100mm Volume: 1-10ml Additive: Plain Time