This beautiful metallic ponytail holder is easy to use with an elastic hairband attached to the inner side of the ring. Also, a strong spring holding the holder at all times, so it won't loosen up on your ponytail. Measurement: ring diameter 3cm Material: brass, elastic ** Please note the ring diameter is 3cm, for clients with very thick hair, 3cm diameter might still be too small to wrap around the ponytail completely. I can not refund or discount due to this reason. Thank you for your understa