Oval Off smoke hole is easy to put into the folded cigarette, and it will automatically extinguish after throwning into the cigarette butts.Double heat resistant structures.Large fire surface, easier to extinguish the fire, limiting the amount of oxygen in the ashtray, for promoting natural fire.Adopt advanced flame retardant materials inside and outside.Eliminate tobacco products are highly functional, smoke coming out after the cover is closed, ensuring fresh car.Ideal for office, home and car use .