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This is a combination tool to mark 24mm wide styrofoam strips. Using a hot wire foam cutter, cut the wedges from the 24mm with strip and hot glue them in place to build inclines and risers for very small radius track. The number is the track radius. The 45, 70, 95 and 120 wedges are 22.5 degrees. The 127 wedge is 13 degrees. Use 2 wedges under each piece of curved track. The numbers are raised to make it easier for you to color them.