A fastener assembly (1, 2) for fastening a fluid dispenser member (3), such as a pump or a valve, designed to be associated with a neck (51) of a receptacle (5), said assembly comprising: a fastener ring (1) provided with securing means (10) for securing the ring to the receptacle neck, and fastener means (11) for fastening the dispenser member (3); and a trim band (2) mounted around the ring (1) in a manner such as to mask said ring at least in part; said fastener assembly being characterized in that said band is made of at least two distinct materials, said two materials comprising a metal material (20) and a plastics material (21).