CritSuccess d20 Dice Ring with 20 Sided Die Spinner (Size 7 - Stainless Steel - Black) RULE THEM ALL - No dungeon master worth his weight in geldings goes anywhere without his 20 sided die. Slide a d20 spinner ring on your finger and keep the critical hits coming. (Ring sizes follow standard US guidelines.) STATISTICALLY FAIR ROLLS- Dice rings can functionally take the place of dice in D&D and other table-top games. The surface area of the numbers or symbols are distributed across the outer spinning band in such a way that matches the probability curve of a random event. IDLE HANDS- Occupy idle hands and calm your mind. Spinner rings (also called worry rings) are frequently used as a stress relief tool, and are beloved by people with ADD everywhere. They have also been used to reduce nail-biting and other bad habits by keeping your hands busy. 100% NERD PROOF - The rings are made from 316L stainless steel so they do not rust and are highly durable. The numbers are etched into the ring using patented laser technologies so there is no need to worry about daily wear and tear. DURABLE COLOR COATING- The colors are infused into the surface of the rings. The color becomes part of the surface of the steel, which means it won't rub off, fade, peel, or chip.