Frame, usually made of wood, type of wood used as a frame sofa among others: Dutch identity, tote wood, meranti, mahogany, pine, etc. During its development, the use of the iron frame sofa / steel is widely used to gain power and the mechanical power of a sofa
Spring system, serves as a barrier power to press on the sofa seat. Spring system is usually made of springs, but can also use webbing / gum as a replacement.
Stand, serves to provide comfort in a sofa. The level of softness vary holder on the tastes of each individual. The use of seat too soft will cause covber become loose, while the holder is too hard will cause sofa comfort level to be reduced. The stand is made of foam, sometimes used as an ingredient per crutch to save the use of foam.
Backrest. Backrest can be made of foam, dacron, and down comforters. Their use depends on the model of the sofa is made. Backrest made from goose feather has a high value.
Upholstery. Key to the beauty of a sofa located on its upholstery. Upholstery fabric cloth can be used, can also use the skin (natural or synthetic / oscar). Selection upholstery should be adjusted to the user's taste theme of the room and sofa.