Liquid Fence CowPots CP4-12 4-Inch Square, 12 Pack, Brown

Can these pots be left in a tray with water or will they disintegrate?

Description says 6 cell cowpots, pack of 12. Does that mean you get 12 strips of 6 cells? People say you get 18 cells in Q&A's. Which is it???

So concretely is it made of cow's crap? In other words this is not a vegan product?

Are the pots square or round? Dimensions? (Can't believe such basic info isn't covered by the vendor in this posting.)