30'L,10'W: plated chromium sheets (mirror finish). 2'wide streching fore to aft. A slight shadow effect where the windshield should be. The craft approached from due east just above the Boca inlet at appox. 100 m.p.h.(estimated) and as it approached it performed a complete 360 degree barrel roll within 50', giving my other witness and I complete and unobsturctive view of the top of the craft. Close enough to notice no rivets were used to hold the plates together. One aspect that should be noted ; (there was no sound) a third member of our party was at least 10 to 15 feet closer up the sand dunes than ((initials of witness #2 deleted)) and I were, and yet he saw nor heard anything! Roll your lips into a big "O" and blow ; sounds just like a U.F.O. to me! I only had time to get off one statement to them and I said, "Thats not nice!" Oh yea , I pointed a finger at them , you guess which one. ((initials of witness deleted))