(1) 3mm acrylic pannel as the face                                                                                                                                                                                    (2) 304#1.0mm stainless steel powder coated as the sides                                                                                                                                                                    (3) Letter thick 50mm(Determined by the size of the letter)                                                                                                                                                                      (4) SMD LED module in side as the light source