end that is substantially parallel with the bottom of the brush frame 101 and therefore substantially parallel to an underlying surface see fig7 in one embodiment the shorter first bristle tufts 104 are not trimmed and the end of the first bristle tuft 104 is therefore substantially perpendicular to the component fibers as a result the ends of the first bristle tufts 104 are not parallel to tie underlying surface consequently as more load is placed on the orbital brush 100 more and more fibers of the first bristle tufts 104 will be forced to contact and engage the underlying surface fig4 shows a bundle of bristle fibers 110 according to an embodiment of the invention the bundle of bristle fibers 110 has been fastened together by a fastener member 116 on tie right of the fastener member 116 are the first bristle fibers 104 and on the left of the fastener member 116 are the second bristle fibers 105 the bundle of bristle fibers 110 includes a first end 111 of the first bristle tuft 104 and a second end 112 of the second bristle tuft 105 the fastener member 116 is located between the first end 111 and the second end 112 the fastener member 116 in the embodiment shown is substantially offset from the center of the bundle of bristle fibers 110 as can be seen from the figure when the fastener member 116 is offset from the center it creates the first bristle fibers 104 of a first length and the second bristle.