1, easy to dust, black is obvious, and it will get dirty soon after rubbing.

2, not fixed, there is still the risk of falling, fixed on the wall, there will be holes.

3, the film is too long, the book will fall off when it is not full, and it should be used in conjunction with the book stand.

4, unfriendly to the picture book display, to be transformed.

5. Choose a color. Gray is not considered at all, white is versatile but easy to appear shelf, black has texture but chooses space size.