David Ross Slim Plastic Cigarette filters for Roll Ups. Once upon a time these very popular plastic Tar filters were reserved for the use on pre manufactured cigarettes. However times have changed and now they are available for use with roll ups for those who want to filter more out of their cigarette. These filters are for use with 5mm filter tips and are reusable. Depending on the tobacco you use they should last for 5-10 cigarettes. For a less harmful cigarette and as a bonus they reduce tar and nicotine stains on your fingers.