High quality, industrial-tough steel blades that are durable and versatile. Innovative rotatable blade cartridge for toolless blade change; simply pull the handle trigger to unlock the carriage, rotate, and engage to use both ends of the blade without touching the blade. Cartridge holds up to 6 blades. Perfect for cutting carpet, upholstery, cardboard, sheetrock and much more. Includes 3 steel blades. Lifetime warranty. Gray and green.