... , finger jointGradeBB/BB,BB/CC,CC/CC,CC/DDFeature:1> High bending strength.2> Strong nail holding.3> Moisture-proof and ... easy work.4> Tight construction and high strength.5> No ratten or decay.6> Low formaldehyde emission ... have any question, please ask me freely.Best RegardsAnnyTrademanager:cn206470000 High Quality Blockboard