1 Flat foam sponge 2 Density from 6-40 kg/m3, 3 Hardness from 7-70 units, variety. 4 Used: Car, mattress,sofa,bed,chair... Name: SpongeType: Ordinary sponge, high resilience sponge, super soft sponge, super-stretch sponge, high flame-retardant sponge, anti-ultraviolet sponge, high load-bearing sponge.Density: Customized, 6-40 kg/m3Hardness: Customized, 7-70 unitsColor: CustomizedMaterials: ...