Ship your liquids with confidence when you use Labelmaster's Polypropylene Caps for Straight-Sided Jars. Designed to fit a 4-, 6-, 16- or 32-oz. glass bottle with mouth sizes of 58, 63 or 89mm, these wide-mouth white caps cut down on spillage when filling or dispensing. You can rest assured knowing that your liquid shipments will arrive intact as we put our bottle caps through extensive testing to ensure tight seals and unrivaled durability.