The Produnkt is flexible and well suited for everyday use at school or the like. Especially it empfelen for children whose Federmappe happy times is a bit crowded because it really is very flexible. However, the processing is not working properly. It has edges and corners on the top two lines of the triangle. The line with the measure, however, is free of irregularities, which facilitates the drawing of Srichen.
All in all a Two sets are for schoolchildren which your triangles also like to break times.