HTD535-5M/15 535 5M 15 Quality Belts for printer size 535 5M 15 Belt New for Zappy Sunplex Vapor+ Tomb Raider 535-5 M 15 Belt for Zappy Sunplex Vapor + Tomb Raider,Quality Belts for printer New belt for 535 -5M/15 Belt for Zappy Sunplex Vapor+ Tomb Raider also fits Pace Saver Plus II Titan, Plus III, and Passport The first number is the belt length 535mm / 21"), belt has 107 teeth The second is the pitch (5mm / 0.197"), the peak to peak tooth spacing. The third is the belt width (15mm / 0.59")