Double Sided Aluminum Core PCB, Thermal Conductivity 2.4W/(m-K), White Color Taiyo PSR-4000 WT02 High Temperature Solder Resist Number of Layer:    2 V 16 Layers (1.60mm thickness) Solder Mask:    Taiyo PSR4000, Probimer 77, Sunchemical Imagecure V Series Peelable Mask:    Peters2955 Surface Finish:    Lead Free HAL, Tin-Lead HAL, Immersion Gold, Immersion Silver, Immersion Tin, Hard Gold, Flash Gold, OSP, Carbon Keypad, Gold Finger Plating.