The picks of the Pro-Grip Brites series from D' Andrea USA are made from Delrin, a material that solves the problem of pick slippage. Each pick is crafted from the most popular material delrin / acetal and is designed and manufactured carefully to approach the authentic result that made tortoiseshell famous. These picks are similar to the traditional 351 picks but have minor variations with sharper tips. The surface that comes into contact with the strings provides players with a different way of expression without compromising the well-known feel of the 351 size. Available in a variety of thicknesses, they are made in the USA.