ACO Polymer Products' ADA detectable warning devices are polymer concrete devices embedded into the surrounding paving material. They are brightly colored to provide a noticeable visual warning. The devices use an anti-slip raised texture on the surface of and in between truncated domes on the surface of the devices. The polymer concrete devices come in 12 x 24 in. or 24 x 24 in. sizes with a common depth of 1.5 in. and come in brick red, gray, or yellow.