1. the surface
Use the rare wood as the surface, have the natural grain and strict deal with the mositure, have the differernce of the mositure between the top and the grass roots. Assure not to craze or distrotion in winter or in the dry place when use it in the warm enviroment.

2. the grass roots
Use the excellent wood which at the age up to 70 yesars, after cuting, braising, drying, change the character of wood avoid the problems craze or distrotion.

3 The coating
Use the Treffert coating, made the surface can resist the blow and rub, improve the elasticity and Tenacity of coating, 7 layer of coating mde the surface smooth and long life.