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The Kingsdown Black Box Spring Foundation is a great addition to pair with your mattress! It’s made with superior materials to ensure your mattress gets the support it deserves. Each box spring is hand-assembled with sturdy Canadian Spruce lumber. The solid wood frame has a durable center and side rails to offer the perfect balance and weight distribution. The head and foot rails are built wider than the other rails to offer complete edge-to-edge support. Each slat is cut wider and placed close together to offer motion reduction and a solid surface that will help extend the life of the mattress.