These poi are constructed from a pair of hollow rubber balls on ropes. I've inserted 5 LEDs in each ball, powered by 12V batteries. The ball is covered with a balloon.
Things you'll need:
- 2 hollow balls - mine are around 3 inches in diameter - 10 (or more) LEDs and some spares - electrical wire - 2 12V batteries (it's possible you'll need more power if you use more LEDs) - rope - 2 balloons - I used 12 inch balloons - electrical tape - four large washers (to add some weight to the balls) - velcro and conductive thread (I used these to make a switch) - glue
You'll also need a soldering iron, wire strippers, a drill, a utility knife, a needle, and pointed scissors.