"BIST Stradivari"@en . "The Stradivari is a one-of-a-kind yo-yo entered into the mod contest at the 2009 world yo-yo contest by Ettore Ferro. It was later used as a prize at the California state competition."@en . "The Stradivari is a one-of-a-kind yo-yo entered into the mod contest at the 2009 world yo-yo contest by Ettore Ferro. It was later used as a prize at the California state competition."@en . . .