Swingline GBC ZipBind Pre-Punched Presentation Kit, Spines, Covers & Paper Included (26007) All-in-one kit includes: 2 black 5/16" ZipBind spines, 4 pre-punched covers - 2 clear fronts and 2 black backs, and 50 sheets of pre-punched paper ZipBind binding spines snap open and closed for quick edits without a machine Materials create two 25 page bound documents