FR4 board for placement and daisy chain continuity testing after assembly. Substrate has 10 mounting sites for 5mm Flip Chip FC112 with 152um (6 mil) pitch FR4 Substrate: Tg 175°C LPI Soldermask Bondable Gold pads Fiducial Marks Daisy Chain Test Points 3.5"x5.5" (89 x 140mm) Thickness .062" (1.5mm)