Sunway ESR PET tube sized 9x120mm is used for determination of the blood sedimentation rate. The tube is made of polyethylene terephthalate(PET), matched with black plastic cap. The additive is the solution of 3.8% Sodium citrate(0.129mol/L). This tube can be used directly in the analysis machine. Compared with the glass ESR tube, it is more safer and convenient for the users.