Sleeve to prevent frostbite, over C02 cartridges. Silicone Rubber Size: For 0.9 oz (25 g) x Φ1.2 inches (78 mm) x Φ1.2 oz (31 g) for 0.6 oz (18 g) / 0.6 oz (59 mm) x 0.1 oz (28 mm) / 0.4 oz (11 g) *CO2 inflators are sold separately. The color and size of the product may look different from the actual product depending on your display settings. Product specifications, logo design, etc. may be subject to change for improvements. We also cannot answer any measurements or personal fit that are not offered by the manufacturer. Thank you for your understanding.