This super clean oil analysis bottle is a Clear PET Heavy Wall Plastic Wide Mouth Bottle with a 38-400 Neck Size. White F-217 foamed polyethylene lined polypropylene closure attached. 24 gram weight PET heavy wall construction. Bottle is able to withstand vacuum pump applications. Particle cleaned with a Clean Identification sticker attached to cap. Oil Analysis Bottles are Super Cleaned Packer Bottles cleaned and certified per specifications for less than 10 particles in the greater than 14 micron size per mL.