... 1/.Single-Sided Aluminum Base ( Bergquist ) PCB, 2/.White Solder Mask, HASL, for Reading LED Light in Boeing 737 Aircraft ... . Single-Sided PCB,Aluminum Base ( Bergquist ),White Solder Mask,HASL,For Reading LED Light in Boeing 737 Aircraft. ... Flash Gold, Immersion Tin, Immersion Silver, OSP,Gold Finger, Peelable Mask, Carbon PrintingMaterialFR4, ROGERS, Taconic, ARLON, BT, Ceramic, Aluminum ...