The outdoor mirrors have a special weather sealed backing, hanging hardware, and a heavy duty sealed rubber molding. Threaded mounting bolts are furnished on the backside of the mirror for attachment to braces. These are necessary for high wind conditions. Acrylic mirrors are recommended for outdoor use, however glass may be used if desired. Shatterproof glass is available in all glass models at an additional cost of $5.00 per unit for sizes 12"", 14"", and 18""; all other sizes the cost is an additional $8.00 per unit.