Sign bases can be made of concrete, metal (iron and aluminum), and rubber. Out of these, bases made of recycled rubber are rather popular as these are heavy and perhaps the most durable of all the sign base materials. Requiring minimum maintenance, these bases are best suited for the outdoors and offer the best resistance to strong winds.  Metal sign bases are also a popular choice, iron bases particularly, that offer benefits such as portability and great resistance to winds, bumps, and abuse. The lightweight aluminum bases are perfect when you want a quality base at an economical price.