Is sofa base spring good or board good?
Of course, the tension spring and bandage woven, some high-end manufacturers, but also in the extension and bandage on the upper layer of plastic mesh. The structure conforms to the principle of mechanics.
After the sponge is stressed, it can be shared by the following structure, not hard on both sides, resulting in irreversible damage to the sponge. The board structure requires low material and cost saving.
