itubes 50ml conical tubes rnase dnase free sterile foam racked

iTubes Centrifuge Tubes Premium polypropylene tubes available in five vibrant colors. Designed for easy labeling with frosted writing areas and flat lids. Certified RNase, DNase, and pyrogen-free, sterilized for stem cell research, and compatible with high-speed centrifugation up to 15,000×g. Available in 15 mL and 50 mL sizes, supplied in convenient foam racks of 500 tubes.