Cheap bad buy, in which the radius has constantly adjusted independently and our son (5th grade) was very annoyed, we ordered the Herrlitz 11122330- and the Faber-Castell 174 472-Rapid adjustment. Both compasses are easy to adjust, but unfortunately it can also come at Herlitz circle when using the radius adjustment, if you press down a little more, which is not the case, fortunately the Faber-Castell. Therefore for Herlitz only three of possible 5 points.