Only the same reflective material mentioned in the rule manual that's always on the tower...
per the rule manual
Quote:
Each of the high GOALS is marked with two (2) vertical strips of 2 in. retro-reflective material (3M
8830 Silver Marking Film) and one (1) horizontal strip of 2 in. retro-reflective material (with the
unsupported .25 in. folded over the bottom edge of the GOAL opening such that 1.75 in. is visible)
to form a u-shaped target. The targets are 1 ft. 2 in. tall and 1 ft. 8 in. wide.
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A picture is shown in diagram 4-29 of the rule manual.