An antique type True Coil Box Springs ensures your Mattress will have a long life span. Custom Coil Box Springs or as some people say Custom Bed Springs, provide shock absorption for your mattress. American Heavy Steel gauge Coils provides much flexibility naturally. Quality Vintage Metal Coil Heavy Duty Box Springs are hard to find these days due to the high quality and the lifespan incurred on your mattress. Coil Springs Box for your Bed usually last at least 20 plus years.