Reddit reviews GBC Binding Spines/Spirals/Coils, 1/2" Diameter, 90 Sheet Capacity, CombBind, Black, 100 Pack (4000068), Model:GBC4000068

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.85-SHEET CAPACITY – Shiny, black spines provide plenty of space to house your printed projects, comfortably securing 85 pages per spine. 1/2" 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 BOX – A box of 100 spines ensures long-term productivity for all of your binding projects.