What are Under-cut acrylic signs?

A sign with individual glower letters that have been router cut out of an aluminum panel or box. Undercut acrylic signs are similar to it's sister product, push-through acrylic signs, but have letters that push in rather than pop out.

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Each letter is CNC router cut out of aluminum. allowing for an acrylic back layer to be mounted and made visible through the cut out letters. The acrylic is then illuminated with LED lights for allowing for beautiful look during the night.