GBC CombBind Binding Spines, 0.25 Inch Spine Diameter, 25 Sheet Capacity, Black, 100 Spines per Pack (4000020) CONVENIENT COMBBIND  CombBind spines allow pages to lie flat for easy reading. Sturdy spines won't scratch, chip, peel or discolor over time. Reliable spines are excellent for busy corporate offices. 19-HOLE PLASTIC SPINES  With 19 holes, durable CombBind spines provide a steady, secure binding, and a reliable choice for almost any project. 25-SHEET CAPACITY  Shiny, black spines provide plenty of space to house your printed projects, comfortably securing 25 pages per spine. 1/4" diameter spine size. EASY TO USE  Convenient, multi-purpose spines are designed for use with all CombBind Machines (sold separately). Sleek spines look great with GBC ClearView and Regency covers. 100 PER PACK  A pack of 100 spines ensures long-term productivity for all of your binding projects.