... . Long Life Span&Reliability 3. Extra Large 4. Environmental Friendly Slim Acrylic LED Light Box♥ Product name: led light sign, light ... box, slim light box♥ Structure of single side crystal light box:♥ Material ... : acrylic panels, 5-10mm light guide panel (LGP), LED lights, etc;♥ Shape: round, square, irregular design shape ...