... heavy, it is apt to out of shape.3. the board is taken as rigidity, it is unable to do the modeling crookedly.4 ... . intensity low, poor to be able to bare climate, afraid of being collided, afraid of water, afraid of damp, and out of shape seriously when being ... . the board is taken as rigidity, it is unable to do various types of modeling crookedly.4. general construction way only being taken ...