It is composed of two pieces of different origin but similar period. The head is in pure white Carrara marble, without veins, and is a copy of a Greek original from the third quarter of the 5th century BC, made in the time of Hadrian (117-138). The bust is in white veined marble from the same period. The identification with Apollo is rather weak, as it is based on the fact that it is modelled on a head with very similar characteristics in the Vatican Museums, today identified as Apollo, but in which, until very recently, Artemis was recognised.