GBC ProClick Easy-Editing Binding Spines, Pronto P3000 Spine Cassette, Medium, White, 80 Sheet Capacity, 100 Spines Per Box (2515707) Easy to edit - zip open and close so you can swap pages in and out quickly anywhere, anytime. Great professional looking presentations - give documents a unique, contemporary look. Anyone can do it - no training is required. 20 spines per cassette, 5 cassettes per box. For use with ProClick Pronto P3000 only