The Cigarette Friend is a holder system designed to remove tar and nicotine from smoke. It achieves this via a crystal filter inside a stem; once you insert your cigarette, the filter cleans the smoke as you draw through the mouthpiece. You can buy Cigarette Friend Holder Replacement Filters refills to replenish your system. This is a package of 20 replacement filters for the Friend Holder. One filter is good for 15-20 cigarettes.