50 mL Bulk Bag Centrifuge Tubes have a glass-like clarity, allowing easy viewing of the sample, printed white graduation markings molded into the conical bottom, ideal for pellet viewing and small volume, and frosted writing area make for easy identification and measuring. Material is made from polypropylene and is sterile. Red polyethylene (HDPE) caps feature leak proof design. Packaged in bulk bags. Max Force 11,000G. Manufactured under ISO 13485:2012 and ISO9001:2008 quality management system.