X-Acto - No. 9RX Retractable Blade - 5 Pack - X-Acto No. 9RX Blades are a small retractable blades for precision cutting of light weight materials such as paper, film, plastic, and cloth. The Xacto No. 9RX Blades work with the X-ACTO X3209 Pocket Clip Retractable Knife. X-ACTO does not offer this item in larger packages. This is the replacement for X-ACTO X9, which has been discontinued by X-ACTO. Includes 5 Blades.