36 boxes of 10 david ross filters for standard cigarettes (regular). these filters stop more or less 60% of nicotine and tar from your cigarette without altering the taste or aroma. each filter can be used for about 5 cigarettes you need to change it when the inner part is filled with brownish substance. . mark . david ross. colors . transparent and red filter. matter . plastic. specificities . david ross regular filters x 36 boxes: . . reduce nicotine and tar levels. 1 box = 10 filters. 1 filter allows you to smoke approximately 5 cigarettes (use the filter until the red mark is covered). . dimensions. filter: diameter x length (mm) 8 x 24 mm.