Beware of the fake Unicorns! Recently I purchased a pair of 0.4 Unicorn hot end's from Amazon at what I thought was the typical price, maybe slightly discounted at $22 USD. I received them in plain white padded envelope bundled with a free silicone hot-ende sock. No Creality logo anywhere on the packaging. Upon installation attempt, I could not get the threads to grab (Thabnkfully) so the install was a fail. I inspected closer and and measured with a caliper against a known good Creality Unicorn and found significant differences in the thread and circumference dimensions. The metal looks the same, and I doubt a copycat producer would splurge for titanium & copper (definitely not SS and copper plate on these). So I guess they were a batch of Unicorns tossed out because they were out of tolerance, and now being resold by some dumpster diver on Amazon. Don't fall for them and stress your printer.