Another successful item was his Colonial Chair in Brazilian rosewood. The altar furniture is made of sterling silver and Brazilian rosewood. Very little is known about the ecology and reproduction of the Brazilian rosewood. Martin originally made the guitar's sides and backs of Brazilian rosewood. Earlier models featured a Brazilian rosewood fingerboard. Brazilian rosewood is highly resistant to insect attacks. Due to its high density and toughness, it is a better choice than Brazilian rosewood. The poplar neck was fitted with a Brazilian rosewood fingerboard, and only had 18 frets. It is best known as "Brazilian rosewood", but also as "Bahia rosewood".