Yup no worries thats fine, its good if you can try them out so you don't end up like me with wheels that are no good!
They are hard but I know they are very popular with lots of derby girls so will work great for someone else. Sim has these ones and I believe has no problems with them.
Heres the link to the spec
Hey, alot of the girls I know aren't staying for the bout afterparty but instead heading straight back to bristol as its the lovely Winged Nuts birthday party that night!