7" Box Spring Steel Folding Bed Mattress Foundation Twin Full Queen King Size. Set yourself up for a great night's sleep with the Mainstays 7" White Jacquard Smart Box Spring. The Mainstays 7" White Jacquard Smart Box Spring sets up in seconds with no tools required and is available in Twin, Twin XL, Full, Queen, King, and California King sizes to create the perfect sleeping platform in any bedroom.
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