... more lightest than bonnell springs. 2)Can vacuum compressed packing. 3)The only hard mattress that can compressed Foshan Chaogang Hardware Factory is ... ),M spring, support springs,steel wires and mattress foam core (can be used in both mattress bed and sofa) and so forth ... you request, however, the minimum height that we can only make is 10cm.* They can vacuum compress packing or roll package. Foam and ...