1. Material:B flute 3-layer corrugated paper board. 2. Size: 330x235mm 3. Colors: white 4. Strong enough to pack books. White corrugate box mailerDescription:White corrugate box mailerItem no:BBC4WMaterial:B flute 3 layer corrugated paper boardSize:330X235mmColor:Whiteseal:Peel&sealUsage:Pack booksPacking:Bulk packing into the outer cartonMain export market:UK Certificate:ISO9001:2008,ISO14001: ...