 It is characterized by palm-muted, syncopated riffs (often incorporating polymeters), as well as use of extended range guitars.Extended range guitars also feature in other forms of progressive metal; artists including Devin Townsend, Dir En Grey, and Ne Obliviscaris have used 7-string guitars without being part of the "djent" movement.Proyecto Eskhata, a Spanish band, has received much press coverage in Spain for its fusion of progressive rock and rap metal, which journalists have described as "progressive rap metal".