This is a set of four Wheel Chrome plated ABS Simulators that offer the benefit of a stylish heavy duty look for your truck, RV or van. They are easy to install and the high impact triple chrome plated ABS is highly impact resistant, and they are much an affordable alternative to the chrome stainless steel version. The AL series comes in both 16" and 16.5" and are designed for single wheel, not dual rear wheel application.