each end extending from the center being defined as one of the u201c fins u201d having a width of 0 070 u2033 as with the prior described bumper 16 in the example shown the helical twist rate is 0 250 u2033 per full rotation but it is understood that other forms and rates of twisting may be used fig6 b illustrates shows bumper 30 from fig6 a in profile fig7 shows cable 10 using three bumpers 30 as defined in fig6 a in another embodiment as shown in fig8 a and 8b instead of a round bumper 16 with profiles grooves 20 another fin bumper 32 may be used in cable 10 to create a similar effect fig8 a and 8b illustrate a three 3 fin shaped bumper 32 in fig8 a the exemplary bumper 32 is formed as a 0 012 u2033 three finned polymer strip with each of the three fins extending from the center having an overall circumference of width of 0 070 u2033 as with the prior described bumper 16 in the example shown the helical twist rate is 0 250 u2033 per full rotation but it is understood that other forms and rates of twisting may be used fig8 b shows the exemplary three 3 fin bumper 32 from fig8 a in profile fig9 show cable 10 using three bumpers 32 as defined in fig8 a in another embodiment as shown in fig1 a and 10b instead of a round bumper 16.