Most of our items are casted in FINJA Fine concrete. It is a plain and cheap kind, that can be bought in sacks at Buliders stores and DIY stores in Sweden. It is a mix with 20% cement, sand and gravel 0-4 mm. You just add water.
Since concrete is cheap and heavy material you find local manufacture all over the world. Don´t compare cheap Asian "concrete" objects with items made of good concrete. Asian "clay" is not made to be frost resistant, and will shatter if they are exposed to cold weather.