I ordered two sets off the heatsink website and i thought they would be like my zoo pads on a grind, super powerful and sharp but at the sacrifice of wear life. I fitted them on and set up my brake really well but i was dissapointed, they were just like my koxx browns, no bite, no sharpness or noise but just a swooshy sound and good lock. I was hoping for them to be super shap and squeaky but they dont even have that and are wearing down very fast. For £6 they arent bad, im gonna wait till i get my new wheel which i wont grind until i fit the other set, when these have worn the koxx pads are going back on for now.