The main difference between a ceramic and a metal ashtray is the material used. Ceramic ashtrays are typically made of clay, stone, or porcelain, while metal ashtrays are usually constructed from aluminum, brass, copper, or stainless steel. Ceramic ashtrays have a more traditional look and feel than metal ones and may be better suited to indoor use due to their non-conductive nature. Metal ashtrays tend to be sturdier than ceramic ones but also require regular cleaning in order to maintain their shine and prevent tarnishing. Both materials provide good heat insulation for cigars when smoking outdoors.