This Trilogy of 3 Sculpted Scooped Curved Grip 351 Shape picks is selected for use on electric guitar, mandolin and other fretted instruments requiring a hard or very hard pick. These picks feature a curved shape giving your thumb and finger a perfect grip. This Trilogy features the US Blues® Signature "Arc of Tone" from the following three materials: Ebony, Black Horn & Amber/Striped Horn. Each is selected to offer excellent tone and response. Horn picks are known for their hardness, full tone and regularity or consistency. Horn generally produces a balanced tone and Amber Horn adds additional nuanced tones that make it extremely popular. These picks are among the hardest wearing in the entire line. Trilogy samplers bring an "Arc of Tone" to your playing. US Blues® offers music accessories made of sustainably sourced exotic materials that improve the tone and modulation of your instrument and therefore your overall playing and enjoyment. We use by-products of various industries, such as guitar making, to source materials that otherwise would not have been re-purposed. We strive to bring the quality of your music to a new higher level and are proud to have elevated the guitar pick to the level of "Pick as Instrument".