The David Ross filter, which is a plastic filter tip that attaches like any holder, does an incredible job of filtering the smoke without losing the flavor. It uses an interesting mechanism which, while it involves small holes in the red insert as filtering agents, does not bring in outside and thus drier air. The four holes in the red insert that separates the tube from the lips "squeeze" the smoke and thus cause excess tar to be accumulated in the filter tip. The tip provides a very nice feel in the mouth or teeth as well as reducing the power of whatever tobacco you are using, all without increasing harshness. All parts are plastic so their is nothing to over-saturate or wear out.