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, 2.8 lbs (9 kg) or 0.6 oz (18 g) cylinders. Waist belt type with a simple and lightweight design. Product Description: Material: Blue, black, and red are 100% nylon, blue camo, gray camo is 100% polyester; Material differences between materials: Blue camo and gray camo patterns are used on nylon fabric, so the pattern will fade away. 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) buoyancy / 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, there may be a few months difference due to different production months depending on the stock and color. Thank you for your understanding. Gas cylinders are not limited unless using gas cylinders. 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. ※※※