1 Number of Layer: 2 to 20 layers. 2 Base Material: FR-4, CEM-3, Teflon, Aluminum Substrate, Rogers, Halogen Free, High Tg. 3 The color of soldermask and silkscreen: Green, White, Black, Blue, yellow etc. 4 Surface Finish: Lead Free HAL, HAL, Flash Gold, Immersion Gold, Immersion Tin, Immersion Silver, OSP, Gold Finger Plating, Carbon Ink Printing, Peelable Blue Mask. 5 The use of product: Our products are used in a variety of electronic applications, including hand-phone motherboard, LCD of mobile, computer display card, blind&buried board, wireless router, medical equipment, MP4 players, DVD players, GPRS, etc. Production cycle: Sample: Double sided printed board: 2-4 days four layers printed board: 5-6 days Six to eight layers printed board: 6-7 days Product: Double sided printed board: 6-8 days Four to eight layers printed board: 8-12 days