Negative pressure collection blood vessel, also called disposable venous collection blood vessel, centrifugal tube, composed of test tube, tube plug, tube cap. Heparin sodium, anticoagulant, sodium citrate, coagulant, heparin lithium, separation gel coagulant can be added to the blood vessels. This product specification can be selected from 2ml to 9ml. This product has "China Medical Device Registration Certificate" and CE certificate. Packing: 100 PCS/bag *18 bags =1 carton.