Ensure your C520 series printer doesn't become damaged from excess toner by purchasing this replacement toner waste box. This box plays a vital role in keeping the printer healthy by collecting all the excess toner that isn't fused onto the page, to ensure that printouts are clean and well-defined. This waste box is designed to store the excess toner from up to 30,000 pages. Lexmark design all their printer parts to work in perfect harmony with the rest of the machine allowing you to buy top quality parts for top-quality printouts.