We looked at the current spin downs out there, and knew we could do better. The beauty of this counter is much deeper than just how gorgeous and heavy it is, but the custom number layout.
You can also use this big 25mm spin down as a regular D20 (there's actually no reason it can't be used as a d20 even though its faces don't follow the traditional "opposites add to 21" layout)
Official MTG counters cluster five numbers at the top, five numbers at the bottom, and 10 numbers running along the center line. The top and bottom sets are easy to spin through, but the 10 in the center have each number alternating 180 degrees, causing you to have to rotate the die half of the time to make sure it faces you correctly.
The layout designed and tested by Paragon City Games is different. Every time you rotate it, it will always be a consistent motion. Shift it over, and rotate clockwise slightly, every time. On top of that, the numbers snake around the die, leaving the 1 face adjacent to the 20 face, making a game reset one quick motion away.
Our Roll Down counters are 25mm from face-to-face, which is 5mm larger than a standard die.