Hello There, I have the porcelain - tried Edding pens and painted cups. Should be a great Christmas gift. Have all made according to instructions. My opinion: You can totally bend the matter. It does not stop !!!!! After a single washing, (by hand even) disappears the beautiful painting. Plus: The pins are indeed favorable - but very quickly empty. Soon I will buy but here in the region, expensive pens and test times, whether the least respected. : O ( Calling all creative people: I am very disappointed !!!. Nevertheless, Merry Christmas!