Sign letters billboard 1.Great luminance 2.Energy saving Safety Longevity 3.Environmental protection Sign letters billboard specification: 1 MaterialHigh level 304# stainless steel,aluminum, and acrylic sheets2Technique Processwelded,polished,brushed,painted,electro-plated3Light SourceLED modules inside4LED FeaturesWaterproof, high lighting, energy saving, and 50.000 hours guaranteed at ...