A MUST!
Reviewer: Breshiki from United States
These add a little more bulk to the size of the flow stick, but if you've used the ball poi's then you'll be fine. The added size obviously makes the sticks look bigger, which makes them more visible while spinning, which enhances the effects and colors.
The rubber material gives the sticks a nice cushion and makes me much more confident that they'll survive an impact (and hurt less too!). It also gives it a little more added weight to help control the sticks.
Personally, this is a must if you own a flowlight.
Crystal Case
Reviewer: Spectro from Germany
These are just awesome! If you have some flowlights or plan to order some, get these too. The color is much more evenly spread around the Flowlight and it's also protecting the Flowlight and your body when you hit yourself. The button on the Flowlight with Crystal Case put on can be pressed easily. Just get them!!