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B=> The seat and springs

To create an even base for sitting, upholsterers sew, and then attach heavy-gauge seat springs individually to a jute webbing using clips. Then the springs are connected one to the other in a methodical eight-way hand tie process. To prevent shifting, a burlap layer is sewn over the springs and a hard edge is formed to add comfort and preserve cushion fronts as well as the outer layer of fabric. Some mid- to lower-end sofas use prefab coil units, which can still be quite good. However, experts agree it's best to avoid zigzag springs, (sinuous wires, stapled across a frame) which are an inferior method of production.



To prevent shifting, a burlap layer is sewn over the springs and a hard edge is formed to add comfort and preserve cushion fronts as well as the outer layer of fabric. Some mid- to lower-end sofas use prefab coil units, which can still be quite good. However, experts agree it's best to avoid zigzag springs, (sinuous wires, stapled across a frame) which are an inferior method of production.

Individual frame pieces are stabilized by dowels and glue, much preferable to nails or screws.

this is over good desingmanufactured with pure leather quality number 1

 A=> The frame 

The frame is the bones of the sofa so to speak and as in the human body, a solid structure is critically important. A good quality sofa in either the mid- to high-end range is typically made with kiln-dried hardwood that is free from knots. Kiln drying is the process by which the moisture is removed from the wood, preventing it from warping and twisting at a later date. The presence of knots in a piece of wood indicates a point of weakness. Lower-end sofas may be constructed of plastic components, laminated boards, metal, or a combination but most of these are less than ideal.