for pencils with diameters of 8 or 12 mm, plastic, closeable collection box
This double pencil sharper from Faber-Castell opens up and closes much in the way a pocketknife does. This allows you to completely hide the sharpener openings after your sharpening work is done – the advantage of this, besides the smaller size when closed, is that no graphite shavings can escape the collector box and spill into your pencil case or bag.