6 Picks To A Pack The new line of D'Andrea Radex Picks will quickly set the standard as the toughest stress resistant pick on the market. Made of proprietary Polyphenylsulfone sheets and fine-tuned by a legendary tumbling and finishing process, Radex Picks are available in 351, 346, and 551 Shapes in .75mm, 1.0mm, and 1.25mm gauges.