NEW!! The Zodiac Collection in hot pink. Contains 12 reversible rings, each with an etched Zodiac sign and its star name. Must order complete Collection to start. For replenishment, individual styles can be ordered. FlipRings are medical grade silicone, hypo-allergenic, ultra-comfortable, waterproof, and won't rub off on your skin or clothes. Weight: Incredibly light. Width: 6mm. Thickness: 2mm. Flip Rings are one size. They are designed to fit snug but will stretch and conform to your finger. Technically speaking they are a size 7 (17.2mm diameter) which is the average women's ring size in the U.S. Not sure what your ring size is - it doesn't matter. Wear them on any finger, thumb or even toes. It's all good.