The size is A4, which is 297mm x 210mm. The grain direction is vertical, and the thickness is 0.9mm. The cardboard color is kraft paper brown. Sale Bonus! If purchased on Monday/Tuesday/Thursday/Friday/Sunday: If you purchase 150 sheets... +10 sheets If you purchase 300 sheets... +20 sheets If you purchase 600 sheets... +30 sheets Approximately 30g per sheet, with the same mass and strength as B-flute (3mm)! For protection and cushioning of gifts, etc. For crush-prevention dividers As backing boards for stickers and seals For crafts, etc. Can be used freely as reinforcing pads for the bottom of cardboard boxes, product protection pads, backing board cards, etc. For science projects. G-flute (0.9mm)