The ring has a flexible band (2) with ends that are respectively provided with female body (3A) and a male body (3B) i.e. hook, of a locking device. The male body is inserted in the body (3A) along insertion direction (D) when the ends are brought closer with each other to close the ring. The male body has a cylindrical trunk (32) extended via a head, and the female body has a through hole (37) with a semi-cylindrical recess (38) in which the head is housed in a visible manner when the male body is inserted in the female body. The link and the device are made of plastic material.
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