I used twenty eight, 22 oz. cans for my wreath, and a 5 ft. length of heavy fencing wire. Cans are heavy, my wreath still sagged a bit, but the fencing wire helped it hold a circular shape.
A small loop was bent in one end of the wire to hold the cans as they were threaded on. I did a pattern of three as I threaded .. two with the crease one way, them flipped the third, but they can be put on any way you want.