Highly recommended glitter contact juggling ball. Glow in the dark with UV light. It's one of the cheapest Acrylic contact juggling Ball with good enough quality.
If you want to start multi contact juggling, I recommend you to buy 4 ( at least 2 ) you can play with 2 balls on each hand. If you have them in your hand during watching movie in your home, you'll get smooth after the movie, that's the way I practice :)

*Don't leave them in the Sun, Acrylic Ball can burn or even make fire in your home.