X-ACTO X209 5pc 9RX Retractable Knife Blades. For light-duty cutting. Paper, film, plastic, and cloth. Precision blades. Works with 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.