... 2. LED display board 3. Material: aluminum 4. Factory direct price 5. Paypal available High Quality Aluminum LED BoardManufacturer Specifications:Number of Layers: 2 ... 28 layersMaterial type: FR-4, CEM-1, CEM-3, High TG, FR4 Halogen Free, RogersBoard thickness: 0.21mm to 7 ... providedCertificate: ROHS, UL, ISO9001-2000, ISO14001Factory direct pricePaypal available High Quality Aluminum LED Board