The D’Andrea USA Pro-Grip Brites picks are made from an alternative material that addresses the issue of slipping. They are crafted from the popular delrin/acetal material, providing maximum memory and minimal wear, features that have made the original tortoise shell famous. Their shape is similar to the traditional 351, but they are slightly adapted with a sharper tip. The striking surface on the strings offers players an alternative way of articulation and expression, without compromising the familiar feel of the 351 shape. Available diameters: .50 / .60 / .73 / .88 / 1.00 / 1.21.