Here are some common materials which are used for free-standing ashtrays:
Ceramic: You will probably have seen this material used in the manufacturing of regular table ashtrays since it is cost effective, heat resistant and easily customized. While the entire item may not be ceramic, the top part is often made from this material.
Metal: This is a popular material for free-standing ashtrays. Not only is it cheap to manufacture metal ashtrays, making them popular with those who are sticking to a budget, but it is also a look which is well-liked by people of all ages and backgrounds.
Glass: You can expect to pay more for an ashtray which is made from glass, and free-standing ashtrays are a popular addition to your garden or workplace. In some cases, the glass will be stained, adding some color and interest to the ashtray, but very often, it is plain and sleek.