The genuine epson s050437 high capacity return black toner cartridge c13s050437 is designed to work with your epson printer to achieve sharp black laser print output the s050437 black toner cartridge can be used for high quality laser printing of documents invoices or envelopes this cost effective toner is geared towards efficient high volume printing with low page costs free postage labels are available for download on epsons website alternatively a toner collection service is avail