Mattress 1.High quality manganese carbon stell spring. 2.Black cotton fabric. 3.High density quilting foam. 4.Modern design. Mattress,Spring mattress1.The spring coil of mattress are made of high quality manganese carbon stell.2.The mattress cover is white cream cotton fabric.3.The quilting foam is high desnity foam for compressed package.4.Soft and relex feeling for design.5.It's healthy for ...