Product name: Immersin Silver pcb Board  CharacteristicLayer count: 6 Board thickness: 1.60mm Base materials: FR4 S1000-2 Finished size:112*93mm Surface finish: Immersin Silver Line width/line space: 4/4mil Minimum hole: 0.25mm Solder resist color: Sensitive green Cu thickness: inner layer 1 OZ outer layer 1 OZSpecifications:Line width/line space is small, the etching is difficult.welding spot of BGA design is small,the diameter of the welding spot is 18mil.