GBC ZipBind Binding Spines, 0.5 Inches, 85 Sheet Capacity, Black, 100 Spines per Pack (4100503) Unique and easy to edit Easy to zip and unzip with the simple slide of a tool Can be used with any CombBind binding system Pages within lie flat with 360 degree rotation for convenient note taking and photo copying Binds up to 85 sheets at once