The stairs looks like thermoplastic to me but from the distributor website (http://highburypools.com/stairs.php) they say it's fiberglass. Mines are granit gray and they don't do themoplastic in this color.
I realise it's a pretty tough job...... I should receive my stairs next week and start removing concrete and digging in the coming days.
The stairs burst and behind the stairs it seems they didn't put much concrete but dirt....I was expecting at least crush stones. I expect concrete at the foot of stairs though. For the liner, if I don't manage to save it, I'll buy a new and install it myself. I should still save big bucks. Conversion rate is 1 USD -1,25 CAD as of now but the pool business sucks in Canada. There is a lot of things we could buy in the US cheaper including stuff coming from Canada but we cannot. We have to find a distributor in Canada that tends to me way more expensive.....