Wing Fat is also engaged in containerboard production at Hebei Yongxin, which is one of the largest containerboard manufacturers in Bohai Bay economic development zone and northeastern China. Its annual production capacity is close to 300,000 tonnes, ranking 6th among all PRC containerboard manufacturers in 2006. Equipped with mid-to-high end containerboard production capability, Hebei Yongxin produces and sells a range of containerboard including linerboard, kraftlinerboard, coated duplex board and testlinerboard, which are some of the key paper materials used in the production of corrugated boxes and other packaging boxes.