Description General description These disposable 5mL Pyrex glass centrifuge tubes are manufactured from Type I borosilicate glass and have a GPI 13-415 thread. They are supplied without caps. The tubes are designed to withstand centrifugation up to 3,000 RCF and are packed in convenient, easy to use packs, which are shrink-sealed for protection during shipment. For reusable phenolic screw caps with white rubber liners, see CLS9999132, for reusable phenolic screw caps with Polytetrafluorethylene (PTFE) faced rubber liners see CLS999813, for disposable phenolic screw cap with rubber liner, see CLS9999913. Legal Information PYREX is a registered trademark of Corning, Inc.