I was a bit worried when I first ordered these, because I wasn’t 100% sure if they would work with the 2018 Helios 300, there weren’t many reviews yet, and no pictures to actually be sure of what I was getting I took my time replacing these and everything turned out perfect the blades aren’t metal like the OEM ones but after running some stress tests my temps are better than ever and I don’t hear anymore grinding noises which is great, I would like to note that for the thermal paste I used thermal grizzly kryonaut which I highly recommend, one thing that is good to know is there is some tape adhering to the other side of the fan, I recommend taking extra care when removing it, I actually ended up making a clean cut with a box cutter and just removing the tape that was on the fans as neatly as I could when I replaced the fans I carefully put some 3m electrical tape on to replace that which is probably unnecessary but I did it anyways