This Trilogy of 3 picks includes three exotic materials in the Exotic Series and is intended for use on electric guitar, mandolin and other fretted instruments requiring a hard or very hard pick. This Trilogy features the US Blues Signature "Arc of Tone" from the following three materials: Buffalo Bone, Black Horn & Amber Horn. These picks are an excellent replacement for real tortoise shell picks (which are illegal and not endorsed by US Blues®) in their beauty and luster. Bone and Horn picks are known for their hardness, full tone and regularity or consistency. Horn generally produces a softer more balanced tone while Bone is brighter, stronger and even harder wearing. 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 repurposed. 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".