Original and unique home assessory, this is a school chemist model of ethylene. Produced and used in Czechoslovakia since 1960s, this model is made of plastic, with a plastic base. It is a stand alone piece, however we do have another piece, a triangle model of plastic balls. The original purpose of this model is undentified, but it looks great! The collection is in bright colors of yellow and matt dark red. Great feature for anyone interested in unique vintage pieces! Great original condition.