0.5ml centrifuge tube,Flat Cap Without any detectable DNA enzymes, RNA enzymes, proteins, DNA, heat and metal Color: Natural ProductsPackage Specification0.5ML Microcentrifuge Tube1000/bag,10bags/ctn15ml centrifuge tube blue & red (cap),25/bag,20bags/cs50ml centrifuge tube blue & red (cap)25/bag,20bags/cs