GSM / Basis Wt: 378 GSM (140lb Cover); Package Quantity: 100 per package - Cover (Card Stock) Paper weight ranging from 300-380 gsm

GSM=Grams per sq. meter | W=Writing or Bond | T=Text | VB=Vellum Bristol | I=Index | C=Cover

GSM 64-90 = 17W, 50T, 60T, 24W  ||  GSM 104-113 = 28W, 70T, 29W, 30W ||  GSM 118-120 = 32W, 80T, 81T ||  GSM124-162 = 84T, 85T, 36C, 91T, 95T, 67VB, 100T, 60C, 90I || GSM 176 = 65C || GSM 180-216 = 121T, 110-I, 78-C, 80-C || GSM 216 = 80-C || GSM 220-255 = 84C, 89C, 90C, 92C, 94C ||  GSM 260-270 = 96C, 100C || GSM 284-298 = 105C, 107C, 110C ||  GSM 300-380 = 111C thru 140C || GSM 432-850 = 160C thru 314C