Its called Ensolite (or similar) it is factory but didnt come painted (its an off white originally) replacing is a bit costly but can be done by ordering it from
Scamp based from what i have read on here before, altho if its not ripped up to bad i would keep it as it can be saved very easily- you should look over my rebuild thread for more details- we scrubbed the Ensolite clean (years of dirt and smoking in it from previous owners) we used spray 9 for that, then we removed all the tape seams and glue and filled the gaps with paintable caulking dabbing it along the way with a wet sponge to mimic the texture (this can also be used to fill tears/holes), then painted about 3 coats of high quality interior latex
paint (i use kitchen/bath stuff so it can be wiped with a wet cloth for cleaning) this brightend up the interior and made it feel like new inside!