I've had a few "magic ball rack" brand template racks over the years. They are the original one. They are/were a Japanese company and came up with the diamond shaped slot ideas that creates a ramp for the ball to slide down and press against its neighbor. That diamond shaped slot is the whole reason the racks work as well as they do. It has to say "magic ball rack", not just "magic rack" to be the good one. I think CSI partnered up with them about 10 years ago and is the distributor for them since. They started as paper about 15 years ago then switched to the thin plastic. The one I have now is 10 years old, has been scratched to hell by a kitty cat, and it still racks as good as when it was new, perfectly.
The only other one I tried was from Amazon, a knockoff that comes qty 6 racks for about $10. They were garbage and I returned them. They were way too thin, and made it impossible to keep the ball in the diamond shaped slot. It would roll right out.