Engineering grade polymer shell covers CO2 cartridges Engineering Grade Polymer with O Ring L2.5 x W1.0 x H1.0 inches (64 x 25 x 25 mm) (for 16 g CO2 cartridge), L3.0 x W1.1 x H1.0 inches (78 x 29 mm) (for 25 g CO2 cartridges) Set of 2 product colors and sizes may appear different depending on the type of the type of display. Product specifications, logo design, etc. may be subject to change for product improvement. We also cannot answer measurements or personal fit that the manufacturer does not announce. Please be aware of