Hitachi Printing Solutions is one of the world's most respected manufacturers of printers and imaging supplies. Manufacturing consumables under its well-known Dataproducts brand name, the company's products range from laser printer toner cartridges to ink jet solutions to all types of typewriter and printer ribbons, along with fax thermal ribbons... hundreds of products in total. The company is dedicated to providing an ever-expanding offering of the highest quality imaging products, along with complete customer satisfaction.This laser cartridge is designed for the following systems:Hewlett-Packard LaserJet 4L, 4P;Apple Personal LaserWriter 300/320;Canon LBP-430, LBP-PX, LBP-PXII;Hewlett-Packard LaserJet 4ML, 4MP.