... pcb,fr2 pcb,fr1 pcb,cem1 pcb,cem3 pcb,aluminum pcb,etc. General Specifications Capability ArticleDescriptionCapabilitySizeMax.Finshed Size20.9 ... .4mm ±0.1mm) Bow and twist < 7/1000 Copper Weight Outer Cu weight 0.5oz ~ 3.0oz Inner ... residual thickness ) FR-4(1/3+-0.1mm);FR-1,FR-2,CEM-1,CEM-3(1/2+-0.1mm) V-cut ... with pcb,kindly contact me for more details! 1.6MM thickness copper clad Single Side PCB Boards