GMi Bonoid nut. Material similar to TUSQ with a high glass content. Improves the instrument in volume, clarity, and sustain. Provides a clear, crystalline sound with rich overtones. It is a very hard and dense material that is easy to sand. Dimensions: 43 x 6 mm. Height (E to E): 8.0 - 8.7 mm, height at center: 8.5 mm, radius: 14.