The Dell MW558 high capacity mono laser toner cartridge falls under the `Use & Return` program, meaning the toner cartridge and be returned for recycling after use. This makes using the Dell 593-10237 environmentally friendly, as well as reaping all the other benefits.With this original Dell MW558 (593-10237) black toner cartridge you can achieve high resolution, impressively sharp images and text at a low cost per page. This MW558 is a genuine dell product that has been manufactured, tested and validated by using genuine Dell parts, ensuring accurate grey-scale reproduction for the life of the cartridge.This genuine Dell 593-10237 black toner cartridge is guaranteed to work in harmony with the Dell 1720 printer. The RP380 is a high capacity cartridge giving the user enough toner to produce up to 6,000 prints (based on a 5% coverage). All of our cartridges come with our 100% satisfaction guarantee and all prices include VAT and delivery.