This product has acquired the model approval for the Ministry of Land, Infrastructure, Transport and Tourism. Type A with cherry blossom mark. When inflated buoyancy, 2.8 lbs (9 kg) and 0.6 oz (18 g) gas canistWaist belt type with a simple and lightweight design. Material: 100% nylon, for blue, black, and red are 100% polyester, for gray camo, and for the difference of materials: Blue camo or gray camo pattern is used on nylon fabric, so the pattern will fade off. Size: One size fits all (waist belt can be adjusted from approx. 21.7 - 59.1 inches (55 - 150 cm)); Buoyancy over 24 hours, uses 0.6 oz (9 kg) / 24 hours, 0.6 oz (18 g) cylinder; Color may differ from the actual product depending on your monitor settings. 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, the production months may vary depending on the stock and color, so there may be several months. Thank you for your understanding. The gas cylinder will not be limited unless the gas cylinder is used. 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. ※※※