This product has acquired the model approval for the Ministry of Land, Infrastructure, Transport and Tourism. Type A with cherry blossom mark. When inflating buoyancy, 24 hours (9 kg) / 0.6 oz (18 g) gas cylinder. Waist belt type with a simple and lightweight design. Material: 100% polyester; One size fits all (waist belt can be adjusted from approx. 21.7 to 55.1 inches (55 to 140 cm)); Approved by the Ministry of Land, Infrastructure, Transport and Tourism Model Approved Product for Small Waters; Color may differ from the actual product depending on the color of your monitor. Country of Origin: South Korea (Korea headquarters factory) Inspection and packaging in Japan; About the cartridge, the black cartridge has an estimate of the replacement date on the main unit. If the replacement date is over the day, the inflator may not work properly. Please purchase the dedicated cylinder and cartridge (model number SW-1800) separately. ● If you purchase multiple items, there may be a few months difference due to different production months depending on the stock and color. Thank you for your understanding. The gas cylinder will not be expired, unless the gas cylinder is used, but please replace it if it is very rusty or dirty. The used gas cylinder will have a hole. Never use any used item. Please purchase the dedicated cylinder and cartridge separately for replacement. ※This product cannot be returned for any reasons. Please make sure you place the order. ※※※