The ring is a 3d mobius strip of an endless loop, representing an infinte cycle, like our life and love. The direction-shifting surface gives the ring more changes and dynamic. It happens on ring crown and turns to flat on ring circle to offer the wearing comfort. The ring is Size 8 (Inside diameter is 18.2mm). 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/.