Rigid flexible printed circuit board manufacturing, rigid flex PCB, RF PCB Layer count: 4 Material: FR4 + Polymide,1.6mm, 1 OZ for all layer Minimum tack: 4mil Minimum space(gap): 4mil Minimum hole: 0.30mm Surface finished: ENIG( Au 2 U") Panel size: 320*330mm/8up Characteristics: rigid flex multilayer PCB,black solder mask www.hiquality-pcb.com