Channel letters are typically constructed from metal, plastic, or acrylic, and are custom-made to reflect a brand's unique identity. They can be illuminated from the front (front-lit), from the back (back-lit), or both, depending on the desired aesthetic effect. These letters are commonly seen in storefronts, corporate buildings, and various other establishments seeking to make a statement. The combination of sponge and PVC in their manufacturing offers several advantageous properties.