Amethyst, Agate, Turquoise, Rose Quartz & Labradorite Stone Guitar and Bass Picks Thick Pick - 3mm in thickness Plectrum is Beveled. Do not fall for competitor stone picks that are not beveled like ours. It takes time to make these picks beveled in a certain way where the pick doesn't roll off the strings and create unwanted noise. All picks are real natural stone so colors and patterns vary These stone picks are for great pick attack playing These picks last a very long time.. much longer than regular plastic picks! Do not drop.. they are real stone!