The phrase "paper: 9 : Double Black" most likely refers to the (often used for cutting paper) or a specific SKU/listing for it. Product Overview
: 9 mm —a standard size for detailed craft and office work. 9 : Double Black
You can find this specific utility knife at various stationery and hardware retailers: The phrase "paper: 9 : Double Black" most
: Available on sites like Yandex Market and Ozon . 9 : Double Black