The velcro-type sanding plate is available in two different sizes: normal and long. Which sanding sheet you use is dependent on what material you are working on. If you are working on wood or wooden materials, we recommend that you use carborundum or aluminium oxide red:Wood sanding sheets with natural rubber bond or synthetic resin bond. Use aluminium oxide white:Paint sanding sheets with active agent coating for paint, varnish, filler or roughcast.