hey I saw you wanted info about the Heartless wheels. I am from viaderby.com and have been selling them and using them for over a month. I also have great feedback from a bunch of girls that are using them. They provide great grip-roll combo as you can mix and match for your needs. There are 6 hardnesses and the feel of the floor and reactivness is great. Needless to say they are super light and look good too.