2013 new !!! Cheap Spring Mattress Ring big core high carbon steel ... materials1, using 72 # 6 ring big core high carbon steel, the height is: 160 mm, caliber: 7 cm, 6 ring, ... . A force spring 65, wire diameter 3 mm.2, the 850 g / square meter yellow hot pressing blanket 2 slices ... 2 slices.3, fabrics: JinBianBu, clamp fly cotton: the 22 d high elastic sponge, thickness of 12 mm, edge cloth flounce cotton ...