For great professional looking presentations - give documents a unique, contemporary look. Spine cassete for use with ProClick Pronto P3000 only. Pre-loaded cassettes of 20 spines eliminates loading individual spines and saves time. Each purchase includes 5 cassettes of 20 spines each. ProClick spines simply zips to open and zips to close. Edit anytime with no machines. Anyone can do, no training required.