●CENTRIFUGE TUBE 15ML-- Conical centrifuge tubes is very suitable for processing precision samples and storing small samples. ●TEST TUBE CHEMISTRY-- Our plastic centrifuge tubes are general in fields of biochemistry and molecular biology,such as separation and preparation of various biological samples. ●TEST TUBES WITH STOPPERS-- The lab tubes is more stable than the cone-shaped test tube station, and no test tube rack is needed. ●CENTRIFUGE TEST TUBE FOR LABS-- EASY TO READ: Black graduations of plastic centrifuge tubes are accurate to ±2%. So these centrifuge tubes are better for science experiments. ●CONICAL TUBE-- With a capacity of 50ml, the test tube is very suitable for handling liquid samples.