36" x 36". Exterior. This convex mirror is made of 1/8" distortion-free acrylic and comes complete with a tempered hardboard backing, attached swivel plate and mounting hardware. This mirror is made to withstand weather conditions, but is not recommended for areas with high wind. If you wish to place this mirror where there is a considerable amount of wind, another mirror is available on special order, please call Safety Media (800) 420-9737 for details.