Heavy-Duty Cartridge Stapler uses color-coded cartridges for easy exchange of staples. Each cartridge is a unique color which corresponds to its stapling capacity. Leverage system allows you to use less effort stapling. Lightweight stapler also offers a soft grip handle, easy portability and a 1-7/10" throat depth. Included cartridge starter kit includes one of each size (2-25 sheets; 26-40 sheets; 41-55 sheets; 56-80 sheets). Each cartridge contains 210 staples.