... , birch, hardwood, combi etc.--Face/Back: okoume, bingtangor, poplar, birch, pine etc. --Grade of F/B: BB/BB, BB/CC, CC ... ,1500x3000mm --thickness: 9mm, 12mm, 15mm, 18mm, 21mm,24mm --Core: poplar, pine, birch, hardwood, combi wood --Film: Chinese black film; Chinese brown ...