This is a vapor corrosion inhibitor paper made by impregnating kraft paper with a rust inhibitor. Effective for steel, stainless steel, and aluminum. Cannot be used on copper products. The rust-prevention effect is immediate, and the rust inhibitor penetrates even into fine details where rust-preventive oil cannot be applied, preventing the formation of rust. The effective rust prevention period varies greatly depending on the usage conditions, but when sealed in a bag, it is effective for approximately 12 to 36 months. Size: 220 x 290 (mm) Manufacturer: Adcoat Co., Ltd. Part Number: GK-7