Wake up happy and reflect on all the great stuff in your life. And when you're not feeling it, just flip the ring!! Details Flip Rings are medical grade silicone, hypo-allergenic, ultra-comfortable, waterproof and won't rub off on your skin or clothes. Weight: Incredibly lightWidth: 6mmThickness: 2mm Size 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.