1.promotion cheap mattress 2.superlastic spring 3.quilted cover foam: density 25kg/CBM ... We are special in producing soft mattress, compressed mattress,promotion cheap mattress,vacuum packed mattress, memory foam mattress, quilted mattress ,leather bed and sofa, and we ... .Spring:superlastic spring, 17cm(H), wire gauge 1.8mm4.Felt : 4 layers felt,550g/sqm5. Insulator:Net 32, noice proof Available Size ...