First of all, in the buy-out we must understand the plywood, it is a positive and negative, and there are differences between the front and back. Good quality plywood front touch is smooth not impetuous, feel no obstruction, inferior plywood is not.

The second step, in the selection of the plate should pay attention to the query, the plate surface is damaged, scratches and other significant problems, such products do not buy, because such products use life span one will not be very long. 

Finally, the use of percussion products can be judged on the quality of plywood. By hand, if you can declare the crisp and pleasant dynamic can judge its quality is good; Conversely, if the announcement of the same dynamic as buckle, then it is indicated that the product presents a loose gum situation.