1.   Materia: Optional  Frabric/Artifical Leather/ Genuine Leather

2. Foam: High density Foam ;

3 .Frame: Four sides planed,  dried solid wood frame combined with multi-layer plywood; 

4. Load-bearing structure: standard spacing serpentine spring + balanced steel wire + balanced net

5.Sofa leg: Stainless steel foot post, stainless steel foot pad,