This is a genuine E3D replacement or spare Heatsink for your All-Metal E3D V6 1.75mm Hotend. This component is a highly precise instrument from the most well know company in the 3D Printing community. Frequently copied but rarely as good, this original Heatsink is built to extremely tight tolerneces in order to ensure the best prints. Clones may try to rival these precise parts, but nobody can match the high quality parts from E3D.