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. 8.5″ x 11″ sheets for laser and inkjet printers. Spine Width: 3″; Color(s): White; Machine Compatibility: Laser Printers; Inkjet Printers.