You can select between: Small, Standard & Large.
Small: 49 mm diameter wide - 1.9 inches
Standard: 55 mm diameter wide - 2.2 inches
Large: 64 mm diameter wide - 2.5 inches
You can currently order only Standard Size on our website, please get in contact with us for the Small & Large Sizes
My wrist measure 5cm
I can fit the small size but it's too tight like a watch style.
I prefer the STANDARD size as it is a bit more loose on my wrist and I feel more confortable.