... grade B, 250, 300, 350, 400, 450, 500gsm, etc. duplex paper with grey back/gray backgrade: A and BGSM: 250, 300 ... , 350, 400, 450, 500, or as requiredUsage:It is used for packaging and printing ... , shirts, cakes, toothpaste, tools, computer accessories, electric equipment, etc. duplex paper