I use tomato cages, the really large ones with a 3/16 wire. I cut the top/middle/bottom circles off of 3 or 4 of them, then form a ball from that, using wire and epoxy. Just slide them inside each other and move them around til they are round. I added a wire hook as well to hang it with. I have both free wrapped the lights and used light clips for wireframes, and clipped m5 leds on them. I have maybe 30 balls that vary from about 10" to 18". They've held up to the weather really well, and I hang them from the rafters in my barn for the summer, using the wire hooks I added to them. For the wire, I used the verticals I cutoff the tomato cages and bent them around the top junction of circles. The really big cages have 4 rings each so you can make 4 sizes of balls.