The tip—at least on the one I ordered—is tungsten carbide, which is a very tough material well suited for printing with abrasive filaments. The rest of the nozzle is reportedly a copper alloy (excellent for heat conduction) and looks to be nickel plated inside and out to prevent oxidation. The entrance and exit holes are precisely machined and circular. The interior has some very faint tooling marks, but is among the smoothest I’ve seen. It’s packaged in a nice sliding cover plastic storage box, with space to store multiple nozzles. If you print abrasive filaments, this nozzle will be a great investment. If you print ordinary PLA, it’d be overkill.[Disclosure: I received this product for “free”—in quotes because the IRS considers the item’s retail value as taxable income for federal income tax purposes. This review is my personally written—not AI generated—honest opinion, and is uncensored by the seller.]