... (FBB): 190GSM - 400GSM Wood free paper: 60GSM - 350GSM White board (CCNB): 230GSM - 550GSM Black card paper: 80GSM - 350GSM (core material) ... duplex grey board: 250GSM-1500GSM Corrugated paper: K, A, B, C; Three-layer ... , five-layer, seven-layer, single face corrugated board Silver card paper, gold card paper, or any material as ...