sofa function frame 1.material:cold-rolled steel 2.surface treatment:plastic spray 3.color:white sofa frame, furniture hardware ,furniture accessory,sofa lifter,sofa hinge,sofa connector,sofa adjuster1. rigorous production process, strict quality control, timely delivery time.2. diffrent sizes are available.3. a visit to our factory is welcome. sofa function frame BL-AF004