These are Styrene Plastic Rectangle Strips.

FEATURES: Used for Bracing and Strapping as well as Steel and Wood Members
          Precision Extruded in White Styrene Plastic
          Ideal for all Facets of Model Building

INCLUDES: Ten Rectangle Styrene Strips

SPECS:    Height: 5/32" (4.0mm)
          Width: 1/4" (6.4mm)
          Length: 10" (250mm)
                                                                   CJH 12/13/99
                                                                          ir/jl