These are Round Solid Styrene Rod. FEATURES: Used for Bracing, Cabling, Piping, Wiring or Conduit Precision Extruded in White Styrene Plastic Ideal for all Facets of Model Building INCLUDES: Ten Round Styrene Rods SPECS: Actual Outer Diameter: .100" (2.5mm) Length: 10" (250mm) CJH 12/13/99 ir/jl