Made by F.lli Ferri s.r.l. at Sarteano ( Si ), near Monte Cetona: Tistarelli Oil Mill. Oil millers for over 50 years, the two Tristarelli brothers, Fausta and Fausto, with the passion for this profession, inherited from their parents and an attentive eye to technology and innovation, carry on the family tradition characterized by love for Signorolio.