N ° 1 in France in rolling papers and in particular the famous OCB slim , the OCB brand offers a whole range of products for smokers including these foam filters with a diameter of 7.5 mm . Made from acetate, these are the most widely used cigarette filters for rolling cigarettes. Using an OCB filter in your roll-your-own cigarette significantly reduces the toxic substances in your roll-your-own tobacco. In addition, thanks to the OCB filter, you will avoid ending up with tobacco deposits on your lips when you smoke.