Architectural Frames in Molded Plastic is a round and square corner system designed for quality interior signage. Nine different sizes can be interchanged to enhance any interior. The seven colors offered are PEWTER GRAY, MEDIUM GRAY, ALMOND, BROWN, ARCH BROWN, BLACK AND WHITE. All frames have a 1/2" outside depth, 1/8" thick walls and mounting holes for attaching to walls. The size of each frame is listed as an inside dimension and the inside radius on the round corner frames is 5/16". Each frame is designed to accommodate all sign material from 1/16" to 1/8" thick, or its own plastic snap-in plate.