Swingline GBC ZipBind Pre-Punched Cover Set, Clear/Black, 10 Pack (26003) COMPLETE COVER SET  Convenient set contains everything you need to create professional-looking presentations. Clear front cover displays your work, while black cover provides protection. PRE-PUNCHED FOR ZIPBIND  Front and back covers are pre-punched for use with ZipBind spines and equipment. NO MACHINE, NO PROBLEM  ZipBind spines and covers are designed to work with or without machines. They can be bound using CombBind equipment, but can also be easily opened and edited by hand. CONVENIENT SQUARE CORNERS  Clean-cut square corners bring solid definition to your bound projects for a neat presentation. 10 PACK  Complete pack contains 10 pairs of front and back covers.