the central tubular portion 322 at a position midway between the forward and rearward sides of the central tubular portion 322 in this illustrated embodiment opposing wing members 354 and 355 comprise a third material specifically an outer layer 340 substantially surrounds an inner core 230 and wing members 354 and 355 attach to outer layer 340 the wing members 354 and 355 may have a different color than outer layer 340 so as to provide stripes or a shading effect running along the length of the fence insert advantageously the illustrated fence insert can be formed by coextruding three separate materials so as to form the inner core the outer layer and the wing members in one step fig7 shows still yet another preferred embodiment of the present invention for a fence insert which includes four wing members 424a 424b 425a and 425b in this illustrated embodiment wing members 424a and 424b extend from one side of a central tubular portion 422 and wing members 425a and 425b extend from the opposite side of the central tubular portion 422 although the wing members are shown to be in line and parallel it is appreciated that other configurations would be equally suitable e g the wing members on each side can be angled toward or away from each other while the wing members of illustrated embodiments of the present invention extend away.