Standard construction consists of a 1/8" thick acrylic substrate with durable 1/32" thick milled acrylic letters adhesive bonded to the surface. Braille is reverse engraved into the surface of the integral colored substrate, and cannot be removed. Available in 22 standard integral copy and background colors for extreme durability. Signs are standard unframed with square corners but may be ordered with radius corners or optional frames. Double face tape mounting is included with optional mounting methods available. Custom typestyles, logos, and symbols are optional on special order. Recommended for both interior and exterior use.