Sofa Sleeper Pull Out Couch Bed Deck Repair Kit, Twin Residential, 44" Sleeper sofa deck replacement Models: 1544, 1548, 2544,2548, 2744,2748,4415,4815, 4425,4825, 4427,4827 Twin Residential This is a Polypropylene deck Includes 10 helical springs| 5 top & 5 side