Check the listing for details. Bed Slats Twin XL Custom Width Platform Mattress Wood Support Boards. Condition: New. Listed at 139.88 USD. Description No International, AK, HI, PO Box, PR, APO/FPO shipping. Ads with FLAT FEE or FREE SHIPPING APPLY ONLY TO THE CONTINENTAL 48 STATES NOT AK OR HI. These custom sized bed slats can provide extra support for your sleeping needs! Just measure the width of your bed frame, in three spots, the head/middle/foot, prior to purchasing your slats. Allow 1/4" play on either side of the bed frame when measuring. They lay on your bed frame, underneath your box spring and mattress, and are held together with the above materials to help keep the slats in position. The slats alone are not designed to support just a mattress, but add to the support of your mattress and box spring. If you don't see the size you need for your particular bed, please contact us and we will be happy to see if we can meet your specific request. Custom made in the U.S.A.! Twin XL are approximately 77 1/2" Long Item is brand new, in the manufacturer's box.It is not seconds, returns or overstock of any kind.