Amazon wants me to mention warmth thickness and sheerness on literally everything I review for some reason...so...uhm, The wires are more than thick enough and then connectors are well made so nothing gets warm except your hot end and print bed,plus all of the connections are reinforced and heat shrinked with really good wire loom fused to the connectors so there's no chance that they will sheer.Really though I bought That's to extend the cables on my first generation TEVO tornado and it worked perfectly Even though I had a couple of extra wires left over.This does seem to be seriously well made but I do see an issue with the wire loom being fused to the connector ends on The screw on connectors since if there's ever a short you're going to have to carefully cut that away and there's no way to to really put it back like it was after that.Overall cheap and good quality and allowed me to put my control unit under my printer.