Number of layer
1-40 layer
Board material
FR-4, glass epoxy, FR4 High Tg, Rohs compliant, Aluminum, Rogers, etc
Solder mask
Green, red, white, yellow, blue, black, etc
Silk screen
White, yellow, black, or negative, etc
Surface finish
HASL, Nickle, Imm Gold, Imm Tin, Imm Silver, OSP etc
PCBA type
Hard, flexible, rigid-flexible