Larger competition size. Not for use with 3-1/2" (89mm) or 4-1/2" (114mm) O.D. posts. Gives the look of glass without the potential for breakage. Constructed with 1/2" (5mm) thick clear polycarbonate that is framed with aluminum extrusions and steel corner brackets. Includes a steel tubular sub-frame for added strength. Silk-screened white border and target. Not for use with 3-1/2" (89mm) O.D. posts. Outdoor use only.