... : 1220*2440*12-30mm 4- grade: BB/BB,BB/CC BLOCK BOARD1.Size:1220*2440mm,2.Thickness:15mm,18mm,35mm,42mm3 ... .Core:Combi,poplar,Paulownia wood,pine.4.Face and back:Okoume,Bintangor,Pencil Cedar,Meranti ... easy work 4.strong nail holding no ratten or decay block board