The Excellart ESP-Flex Retro Frame, crafted from high-strength 6063 aluminum with a T6 temper finish, is our standard choice for flex frame systems, perfectly suited for retrofitting rigid face or stick-built signs to flex face. This frame includes built-in backing and accommodates additional components to achieve the required depth, enhancing its versatility within flex frame systems. Unlike the standard model, it does not have tubing built in. This frame can be attached directly to the wall, making it ideal for retrofit projects where smaller adjustments are needed to meet specific depth requirements.