X-ACTO : #11 Bulk Pack Blades for X-Acto Knives, 500 per Box Precision-crafted of the highest quality carbon. Blue oxidized finish for rust resistance. Designed to handle a variety of tasks. Stock up and save! Global Product Type: Replacement Blades-Hobby Knife; Blade Type: Hobby Knife; Cutting Edge Form: N/A; Material(s): Carbon.:Manufactured by.: X-ACTO