This is a Traditional Styrene I-Beam.FEATURES: Used for Horizontal and Diagonal Members Precision Extruded in White Styrene Plastic Ideal for Museum Quality and Smaller Scale ModelsINCLUDES: Four White Styrene I-BeamsSPECS: Height: 5/16" (7.9mm) Width: 5/32" (4.0mm) Thickness: .045" (1.1mm) Length: 24" (600mm)PlastructPart PLS90511