Color classification
[Double] Black Frame + Walnut Board 50*28.5*13.5
[Double] Black Frame + Walnut Board 40*28.5*13.5
[Double] White Frame + Whiteboard 40*28.5*13.5
[Double] Black Frame + Blackboard 40*28.5*13.5
[Double] Black Frame + Blackboard 80*28.5*13.5
[Double] White Frame + Original Board 40*28.5*13.5
[Double] White Frame + Whiteboard 50*28.5*13.5
[Double] Black Frame + Blackboard 50*28.5*13.5
[Double Layer] White Frame + Original Board 50*28.5*13.5
[Double] White Frame + Original Board 80*28.5*13.5
[Double] White Frame + Whiteboard 80*28.5*13.5
[Double] White Frame + Whiteboard 60*28.5*13.5
[Double Layer] Black Frame + Walnut Board 80*28.5*13.5
[Double Layer] Black Frame + Walnut Board 60*28.5*13.5
[Double] White Frame + Original Board 60*28.5*13.5
[Double] Black Frame + Blackboard 60*28.5*13.5