20ft cheap modular homes prefab sandwich panel material expandable container house

20ft cheap modular homes prefab sandwich panel material expandable container house ISO9001:2008 Certified Expandable Modular Container House , modular kits homes Features: Safty and reliable light steel flexible structural system Easy to transport, assemble and disassemble, repetitive to use Good and attractive apperance Waterproof, soud-insulated, heat preservation, seal, easy to clean and maintenant Any dimension and customized design are available Widely modal application,