Stone Aggregate Urns – Shown below are our 24″ and 36″ stone aggregate cigarette urns. All of the cigarette urns are self-draining. They have a porous top that allows rain or snow to bleed down through the composite body of the ashtray. The water seeps slowly so most of it is absorbed and does not rush out of the bottom. The entire urn is finished with a sealant to repel dirt and provide weatherproofing.