Review on 🔥 Pack of 10X 900M Soldering Iron Tips Compatible with HAKKO 936, 937, 907 Atten, Quick, Aoyue, Yihua, Vastar, Sywon, Tabiger, SOAIY, and X-Tronic Soldering Stations - 10 Different Pieces by John Destruction

I just bought these tips to replace worn out ones that broke in my Aoyue machine. I don't know what these tips are made of, but they don't tin, they react with the solder paste and immediately coat the tip and barrel with a weird black coating. I removed SOS it and it did it again. The gaps are wrong, even if the element does not reach the top, the head does not heat up and periodically cools down.