One is blue, the other one white. Don't know much about inline skates in general but the roller is rolling, the skate is skating, not sure what else to check. Kid says they are great skates. We got them used. I mean, child was literally begging for them. Not sure if i've seen them 10 times on feet in total. Probably just 8. Then we got another pair, same story. Anyways, they have to go, Please buy it.