1. Wooden frame: which use solid wood to make tenon,fixed with glue.
2. With import textile fiber rope material for bottom render, pure American craft, 8 directions ties up, with independent spring structure.
3. Sandwich type seat cushion with dolls cotton and goose down material.
4. packing: use plywood, Baoli foam, the adhesive-bonded cloth, shrink film and moisture-proof bead, vacuum packing.
5. Foam cotton: fire-resistant standard with American California.
