I have two Bohin pencils, one for white and one for darker color chalks. I have spent lots on pencils to try until I found these and now will use these all the time. I love them. The interesting thing is that if you mark lightly you can erase with the eraser on the end of the pencil. Buy the set with the mix of colors and then you can get an extra cartridge of white later. PS they don't have to be sharpened!!! Good luck,