We purchased glow in the dark bracelets and necklaces for this activity. The youth wore the bracelets to distinguish one person from another. Across the top of the volleyball net we continuously hooked the necklaces together. It took about 20 to go across one net. We purchased the bracelets from illuminationz.com. They were very reasonable. Since we only needed 20 necklaces we purchased them at the dollar store. We used beach balls for the “volleyball”. If you put some glow bracelets in the ball it glows quit well. This activity was a lot of fun and pretty easy.