ZERO GRAVITY
              Pull Force Comparison
         25
         20
         15
                          Keep-Rolling-Force
         10                          Start-Rolling-Force  Keep-Rolling-Force  Keep-Rolling-Force
           5                                                 Start-Rolling-Force     Start-Rolling-Force  Keep-Rolling-Force  Start-Rolling-Force
           0
                    Competitor 1             Competitor 2           Competitor 3             P&H Casters
                                            Average Force                Peak Force
                                                                                                                 7