These are Fineline Styrene Square Tubes. FEATURES: Used for Concrete Columns in Construction Precision Extruded in White Styrene Plastic Ideal for Museum Quality and Smaller Scale Models INCLUDES: Five Square Styrene Tubes SPECS: Height: 1/4" (6.4mm) Width: 1/4" (6.4mm) Wall: .025 (0.6mm) Length: 15" (375mm) CJH 11/30/99 ir/jl