Here you go One thing I would mention is that the skate buckles, being plastic, may not hold up to alot of play. I don't know if you can see the stressed blue part (looks a bit paler in the pic). It might be worth asking your seller about the buckles and how much play the set you're bidding on has seen.
There are ratchets on them just like real in-lines, and yours must be ratcheted closed too tightly. Loosen them up a bit and then they shouldn't be so stressed like that.
My set also didn't come with elbow pads either, fwiw, though I admitt that I sometimes put the knee pads on the elbows, and not the knees, because I'm more inclined to fall backwards on my bum (risking hitting my elbows) than I am falling forward on my face and risk hitting my knees.