This unit supports A4, Folio, Letter, Legal and Oficio sizes stapling from up to 2 to 20 sheets per set (20 lb., 75 gsm). This stapler supports sensing to indicate when the staple supply is low and when staples run out. The staple cartridge contains 1,000 staples. Refill staple cartridges are available in a package of 5 cartridges. The staple cartridge contains 1,000 staples. Refill staple cartridges are available in a package of 5 cartridges. This stapler supports sensing to indicate when the staple supply is low and when staples run out. This unit supports A4, Folio, Letter, Legal and Oficio sizes stapling from up to 2 to 20 sheets per set (20 lb., 75 gsm).