... of the top level free pcb sample, free sample pcb board, request sample board, custom sample pcb, pcb sample prototype, pcba sample service manufacturers and suppliers. ... Type1+N+1, 2+N+23MaterialCEM3, FR-4, Halogen Free, Aluminum-based, Teflon,Rogers, Getek, Nelco, PTFE, Polyimide ... +/-10%22Outline Tolerance±0.10mm (4mil)23Surface FinishHASL, Lead free HASL, Immersion Gold/Tin/Silver, OSP, Flash Gold, ...