The Phi was the second yo-yo design commercially released by Kyo. 150 yo-yos were made, of which 125 were sold through online stores, all of which were laser engraved with a unique serial number. The Phi is a large bearing yo-yo with a slick teflon finish and it came stock with Paul Yath's Carbon Fiber Friction Stickers. It started started shipping to customers from Infinite Illusions on May 11th, 2005.