The product is a set of four brand new Canon Drum Unit 034 cartridges in magenta, cyan, yellow, and black colors, designed for laser printers. Each cartridge has a page yield of up to 32500 pages. The compatible models for these drum units include Canon Color imageCLASS MF820Cdn and Canon Color imageCLASS MF810Cdn. This set provides a full range of colors for high-quality printing and is suitable for various Canon laser printers within the specified models.