Description_x000D_ General description_x000D_ Corning® Costar® microcentrifuge tubes with snap caps are made of polypropylene and are certified RNase-/DNase-free._x000D_ • Supplied nonsterile and are autoclavable_x000D_ • External graduations and frosted writing spot for easy sample identification_x000D_ • Positive seal design allows for repeated opening and closing_x000D_ • Flat cap surface for convenient labeling_x000D_ • Withstands a maximum RCF of 17,000 × g_x000D_ • Assorted color pack includes one bag each of blue, green, yellow, red and orange tubes._x000D_ Legal Information_x000D_ Corning is a registered trademark of Corning, Inc._x000D_ Costar is a registered trademark of Corning, Inc.