I have found that these sanding sticks work quite well for my various model sanding needs, with their variety of grits. I generally remove any particle build-up on them with a few light thumps onto a napkin/paper towel, or a few light flicks with a parts cleaning wire-bristle toothbrush. For sanding sticks, they are of nice quality, and are sturdy. I would recommend them to others for their model sanding needs.