This pack contains two of the CLT-K4072S/ELS which are also available individually and represents a significant saving over purchasing two. Buying a multipack like this also means you have a spare K4072S toner for those times when you are caught short. You can expect reliability with this original Samsung CLT-P4072B twinpack of black toner cartridges, as it is a brand new product designed, manufactured and tested using genuine Samsung parts. Samsung`s unique toner formulation within these CLT-P4072B toner cartridges guarantees high quality, high resolution prints for the life of the cartridges. The original Samsung K4072S twin-pack is be compatible with various Samsung printers (like the Samsung CLX-3180 toner cartridges) and a full list can be found on this page. The genuine CLT-P4072B/ELS multipack will need to be changed after roughly 2,000 pages total (based on a 5% coverage).