ARIES ActionTrac boards are the next generation of power running boards. These patented side steps are unique from other power step designs because they feature a step-within-a-step& trade;. They are equipped with smart sensors for safe, smooth, automated operation; they install with no drilling required; and they feature weather-resistant, powder-coated aluminum construction. These replacement magnets are designed to attach to the inside door sill and activate the control module. Four magnets are included per package.