Card structure classification

Nine-foot type wooden card board: the back side of the card board is distributed in nine feet. The four sides of the square card board and the four corners each have four foot cards. There are nine feet in the middle. One foot is generally arranged side by side for three feet. The three groups of feet are parallel.

Chuan-shaped wooden card board: on the reverse side of the nine-foot type wooden card board, the three sets of feet are arranged in parallel on the reverse side.

Tian type wooden card board: three sets of feet and three sets of foot types on the opposite side of the reverse shape of the nine-type wooden card board are formed into the shape of "Tian".

Japanese type wooden card board: The three sets of feet and the vertical two sets of feet on the reverse side of the back surface of the nine-type wooden card board are formed into a "day" shaped card board.

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