The high-quality erasers and sharpener boxes of the Sleeve and Sleeve Mini models disappear after use into a red, blue, or black case that not only protects against dirt but also allows for precise guidance of the eraser stroke when open. For the sharpener, the case serves as a practical waste container. The Sleeve has already received an award for its ergonomics and user-friendliness - the ISPA Award 2007 in the "Back to School" category. This is further proof that even simple items like erasers and sharpeners can still be improved.