Replacement cartridges keep your Rapid Heavy Duty Cartridge Stapler ready to go at a moment’s notice. Color-coded for maximum ease of use for both large and small stapling jobs. Heavy duty staple cartridges are color-coded to match up to a specific sheet count. Blue for 2-25 sheets Yellow for 26-40 sheets Green for 41-55 sheets Red for 56-80 sheets. Color guide on the base of the stapler helps you find the right cartridge for your stapling job. Full strip of 210 staples per cartridge. Each color cartridge sold separately; 5 full strip single colored cartridges in each replacement box. For use with Rapid Heavy Duty Cartridge Stapler only.