Merax 6 Inch Comfortable Sleep Built-in Pillow Top Inner Spring Mattress (Twin) TWIN6-inch Mattress uses 216*high quality 13.5 gauge tempered steel spring coils for long lasting support Mattress Core Construction: Innerspring Dimensions: 6.0 " H x 39 " W x 74 " L Comfort Type:Firm Warranty Description: 25 Year Limited Manufacturer Warranty