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 Models INCLUDES: Five White Styrene I-Beams SPECS: Height: 3/16" (4.8mm) Width: 3/32" (2.4mm) Thickness: .035" (0.9mm) Length: 24" (600mm)