Material: Polymide 0.2mm + FR4 stiffener 0.5mm, 0.5 OZ for all layer Minimum tack: 4mil Minimum space(gap): 4mil Minimum hole: 0.30mm Surface finished: ENIG( Au 3 U") Panel size: 20*130mm/1up Characteristics: FPCB,silver covered holes http://www.hiquality-pcb.com/Pro/pro_show/pid/49.html