We bought this set for the treats, unfortunately could once only the sharpener can be used, because the pins are too thin. In the 1st and 2nd class will prefer working even with the slightly thicker pencils. But as ever are pencils "verschusselt", it's always good to have a few in stock, this set would buy again and again, mainly due to the write-oriented form of pins (triangular) and the anti-slip coating on the pin. The Radiergummiaufsätze are a great idea. If the pen times "depleted", you can simply plug the Radieraufsatz to another pencil - great idea.