3-STEP HDI BOARD◆Layer Count:22L◆HDI:3+N+3◆Material:FR408HR◆Board Thickness:1mm±0.1mm◆Min.Hole Size:0.15mm◆Micro vias:L1-L2,L2-L3,L3-L4,L19-L20,L20-L21,L21-L22◆Via-in-Pad:VIPPO◆Min.Trace/Space:3/3mil◆Surface Finsh:ENIG