Avery 89109 Binder Spine Inserts, 3" Spine Width, 3 Inserts per Sheet (Pack of 5 Sheets) Customizing your binder spines has never been easier or faster. Create professional-looking spines with binder spine inserts using free templates from Avery Design & Print. Micro-perforated cardstock allows for easy separation of each spine. Firm cardstock makes it even easier to insert each spine into a binder.