Material: Green Goldstone. Instrument: We recommend Mineral Guitar Picks for precise picking on Arch-top Jazz Guitars. These picks are not suitable for strumming on an Acoustic Guitar. Tone: Although our mineral picks are relatively hard compared to other materials in our range, the large playing tip helps to ensure a surprisingly warm tone. Design: All of our mineral picks have been designed thick and easy to grip with a chamfer that leads down to a well-defined playing tip. The tip itself has a relatively large radius in both axis to offset the brittle nature of materials with this level of density. Contents: This pack contains 1 Green Goldstone Guitar Pick. Notes: Although we have tried to ensure that our photos represent the Guitar Pick that you will receive, there is a high level of variety in our picks due to the nature of many of our natural materials.