These extra hard plaster of paris stones are carefully prepped for dotting. After casting, they are dried for a week. Then sanded down and holes are repaird. After that it goes through a 2 day priming as well. Then it’s ready for you to decorate! Dimensions 8cm(W) x 10cm(L) x 1cm (H) – Largest Stone of the 3 8cm (H) – All 3 Stacked