CryoCLEAR vials, 5.0mL, Sterile, Internal Threads, Attached Screw Cap with Co-Molded Thermoplastic Elastomer (TPE) Sealing Layer, Round Bottom, Printed Graduations, Writing Space and Barcode, 50/Bag, 10 Bags/Case. Lot certified to be human DNA free, RNase free, DNase free, pyrogen free and ATP free