1) All Selected, solid dried hardwood, aridity is under 13 degree.
2)Use Semi-Aniline leather (1.3mm to 1.8mm thickness leather)
3)Backrest foam use 27 to 30 density high elasticity foam.
4)Seating foam use 30 to 40 density high elasticity foam, keeping comfortable feeling.
( all foam can be used more than 10 years, doesnot transfiguration)
5)cushion use 80% nature goose down and 20% PP sponge
6) right now we use stainless steel at the bottom of sofa seat, instead of rubber belt, which will be stronger than ever before
7)  We ues 2.8cm thickness MDF in place of General Factory used plywood on the wood frame, which will be stronger and will not be trampled when load containe
8) wood frame is keeped tightly by screw.
9)Smooth solid wood sofa feet are used