i bought these wheels last year,wasnt too sure about them,so here is my opinion: the first time i ran them (in the rink on hardwood floors) they were kinda slippery,when i ran them the second time,they were much better i guess we have to break in the wheel! the third time and so on they were great-no complaints,grip was good for the hardness,they glide good-just recommedn a good bearing,as mine are ancient.lol