The inner, thicker ring signals the hour, and the outer, thinner ring the minute, according to the standard positioning of numbers around a watch or clock face. In the bottom row of the image to the right, for example, the watch faces are indicating a time of approximately 2:25. The Ziiiro Gravity is available in six color schemes, which consist in different combinations of ring and silicone-metal wrist band colors. The higher-end Mercury only comes in four but features a stainless-steel wrist band. The Gravity's pop-out face and interchangeable colored rings allows buyers to experiment with multiple color configurations.