The conical centrifuge tubes are made of virgin polypropylene. Easy-to-read black graduations are in 1 ml increments (15 ml) or 2.5 ml increments (50 ml) increments with a large black graduations with a large un-erasable frosting white printed writing area. Smooth, flat surface plug seal caps for conical bottom tubes are included. The tubes are leak proof and withstands up to 12,000 x g for conical bottom tubes, while 6,000 x g for self-standing tubes. The tubes are Leak-proof and can withstand the freezable to temperatures -80°C.
All tubes are Sterile, DNase, RNase, and Pyrogen free