Black rubber bracelet.
To work out the correct size bracelet for you:
Make a fist of the hand the bangle is to be worn on and measure the length from the outside of the first knuckle to the point between the third and fourth knuckle. -see last image.
This measurement equals the required internal diameter of your bangle.
for example, if the measurement comes to 6.5cm, then a 6.5cm (inside diameter) bangle should fit your hand.
Inside diameter:
small 6 cm / 2.4 inches
medium 6.5cm cm × 2.6 in