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
: High-quality SK2 steel , often black-coated for increased durability and wear resistance. 9 : Double Black
: Equipped with an auto-lock mechanism to prevent the blade from slipping during use. The phrase "paper: 9 : Double Black" most
: Available on sites like Yandex Market and Ozon . 9 : Double Black