This is a Plastruct 90513 1/16 x 15 x 1/8 Styrene I Beam (Pack of 8). Use for horizontal or diagonal members in the construction of most steel structures. Precision Extruded or Injection Molded in White Styrene Plastic. Ideal for museum quality and smaller scale model construction where assembly speed profile accuracy and cost are the determining factors. Manufacturer: Plastruct Model Number: 90513 Scale/Era: HO Modern Model Type: Miscellaneous