DetailsGroove Life Ring Size Chart Groove's Thin Solid Colored ring is is also available in unique, swirled metallic colors. Pairing perfectly with any outfit, our new Black Pearl metallic ring adds a subtle metallic flash. Our one of a kind grooves allow breathability and comfort like you've never seen before with a silicone ring. Designed to keep air in, and moisture out, you can't go wrong with this ring. The medical grade silicone ensures that your ring will remain flexible and comfortable no matter what it goes through. This ring is the perfect choice to replace your old metal ring.