... back duplex board ,gray back duplex board ,corrugated cardboard or cardboard.Quality:140g(high-hard);120g(high-hard);110g(reinforced ... corrugated)Features: high hardness and light weightCategories: five kinds –cardboard box ,printed box pallet box, achive box & printing ... etc. paper products ,various finishing: hot stamping ,matte or gloss lamination, UV varnishing ,printing, flocking and embossing, ...