The ring is a combination of two 3d mobius loop, representing the interwining love. The direction-shifting surface gives each loop more changes and dynamic, and creates more flexible and diverse combination. It's a good choice for couple ring. The ring is Size 7 (Inside diameter is 17.35 mm). Please don’t hesitate to contact me if you want other size. For the ring size, please refer to the chart below: http://www.ringsizes.co/.