2 separate boxsprings used for a King-size bed frame, or it can also be used as 2 separate Twin XL boxsprings. I believe the length is longer than a regular Twin bed frame measurements are approx 79.5"L x 38"W x 8.5"H. In good condition. I used these for my previous mattress, which was a double-sided pillow top, and the mattress never lost shape. These are very sturdy, wood vs metal, but some of the newer metal boxsprings have a lot of gap between slats, which can cause mattress to sag. This one does not. Non smoking home