|: So it chips easily?
I don't think so. You are probably thinking of PVC, which is quite bad. There were often cheap skates with PVC wheels and they chipped easily. I'd guess there are few material which are less suited for wheels than PVC. Steel is better, stone is better, I'd even prefer wood to PVC.
: Or does it hold up OK to grinding?
From the looks I'd suppose the material is similar to the one my sliders consist of and therefore well suited to sliding (not grinding, roller skaters grind their trucks).
: I'm about unemployed, hum, maybe I'll go back to making signs lol.
Not glad to hear about this. Hope you find a good new job soon!