| 摘要 |
In the present invention, provided is a natural lumber which has engravings on a upper part thereof and is filled with a composition for preventing slides in the engravings or a natural lumber with a slide-preventing layer where an I-shaped fixing device is attached to block noise generated when used. According to the present invention, the nature lumber with the slide preventing layer comprises 5-20 wt% of a first filler; 0.2-10 wt% of a second filler; 65-90 wt% of a third filler; and 0.2-5 wt% of a fourth filler. |
