Marwin Marwin Superior Folding Attic Stairway 22.5 x 54 8 ft. 9 in.The Marwin Superior Folding Attic Stairway is designed with the Pro Contractor and quality oriented dealer in mind. All wood components are sourced from the highest grade southern yellow pine lumber with quality and safety in mind. All Marwin Folding Attic Stairways come with a lifetime spring warranty. Overview 300 lb duty rating 350 lb duty rating (Superior Plus) 1x5 Frame and Stringer 1x6 Tread Two Strong Metal Handrails Features CARB certified