558P.88 Tortex Flow; With Tortex, Jim Dunlop launched a revolution, and the world of picks has never been the same. The turtle logo is instantly recognizable, and the vibrant Tortex palette has become a gauging shorthand for guitar players. Go into any music store and ask for Green or Yellow Picks—chances are, you’ll be shown a pack of Tortex .88mm or .73mm Picks. Countless musicians across the world, representing every genre and playing style, have chosen Tortex Picks to help them do what they love.