... blank pcb, single sided pcb,double sided pcb,multilayer pcb,flexible pcb,fr4 pcb,fr2 pcb,fr1 pcb,cem1 pcb,cem3 ... .008”±0.004”(0.2mm ±0.1mm)4-layer:0.01”±0.008”(0.4mm ±0.1mm)8-layer :0 ... .01”±0.008”(0.4mm ±0.1mm)Bow and twist< 7/ ... with pcb,kindly contact me for more details! red small flexible pcb