Suggested Retail:$118. KING Spa Sensations by Zinus 9" Standing Metal Smart Box Spring. The Spa Sensations by Zinus Standing Smart Box Spring in Multiple Sizes provides sturdy support for the mattress of your choosing. Compact packaging allows for navigating tight interior spaces, such as stairs and hallways, when moving it to your bedroom for unpacking. This 14" box spring also includes all the necessary tools to make assembly simple. With leg supports and even headboard brackets also included, no additional frame is required. The metal inner structure creates a strong and reliable support system to keep your mattress level and balanced while you sleep. This Spa Sensations smart box spring is available in a selection of sizes (each sold separately) to fit your space and requirements.. 7 DAY FULL REFUND GUARANTEE ON THIS ITEM IF ANY ISSUE IS FOUND THAT WAS NOT DESCRIBED/PICTURED. 7 DAY STORAGE IS ALSO AVAILABLE. SEE NOTES TO BIDDER, IN AUCTION DETAILS, AT THE TOP OF PAGE 1 FOR MORE INFO.