ITEM: RETRACTABLE PERMANENT MARKER BLACK, BLUE, RED AND GREEN INK,CHISEL TIP, 4 COLOR AbilityOne Skilcraft. BRAND: AbilityOne Skilcraft. MANUFACTURER PART: 7520-01-554-9540. NATIONAL STOCK NUMBER (NSN): 7520-01-554-9540. CATEGORIES: AbilityOne Skilcraft. Office Supplies. SUBJECT MATTER: AbilityOne Skilcraft. KEYWORDS: AbilityOne Skilcraft.