Zlin Z526 - Czech Aerobatic Model 1:33 scale GELI models are more than a few printed sheets of paper, they are technical cultural assets and a piece of contemporary history. GELI models are something special. They have charm and character. They were the world's first cardboard models on a scale of 1:33. The result is the feel of GELI models that is still typical today. Despite enormous advances in printing technology, GELI models still demand to be produced in the time-honoured way. 34049.