1.mattress spring 2.72A High-carbon-steel wire 3.size:Twin Full Queen King 4.style:288 ... , the better the quality of the mattress, state regulations, each mattress spring coverage must be considered in the ... 60% standard, samedream each mattress up to 80% coverage far beyond the national ... cotton, sponge: to ensure that the entire mattress soft and comfortable, and with a warm role ...