Williams/Bally Round Stand-Up Targets - Rear Mounting.
Williams/Bally reference numbers:
A-14690-4 or B-11854-4- Red (not shown in picture. Used in Bride of Pinbot)
A-14690-5 or B-11854-5 - White (used on Terminator 2).
A-14690-6 or B-11854-6 - Yellow (used on Star Trek; The Next Generation).
A-14690-15 or B-11854-15 - Orange (used on Terminator 2).