Available in Clear or Amber borosilicate glass. Vials resist chemicals and permeation of oxygen. Caps have a PTFE resin lining backed with polypropylene foam, so they can withstand higher temperatures (up to 190°F) than caps that have PTFE resin lining backed with polyethylene foam. Vials and caps are assembled in a shrink-wrapped box. 2mL, 4mL, 6mL, 8mL, 11mL and 22mL capacity with various neck/finish sizes.