Kings Brand Furniture - Metal Twin Size Roll-Out Trundle Bed Frame with Slats Support, Cream White This simple, metal trundle bed frame features slats to easily support a twin-size mattress, while the casters make it easy to pull out when you need it. Whether you need extra space in the guest room or want to be ready for slumber parties, this simple bed frame is the perfect solution. Bed Size: Twin. Finish: Cream White . Materials: Metal Overall Dimensions: 73"L x 39.5"W x 3"H