Made of ox bones material, the noise is small, and it can create better guitar tone. It serves as a better string support to provide more vibration and a better upgrade in tone and sustain. With sturdy, lightweight, wear-resistant, durable features, it is a must-have accessory for your guitar. Features -Color:Ivory -Material:Ox bone -Size:4.20X0.48X0.32cm/1.65X0.19X0.13in - It is mainly made of safe ox bones, which is sturdy, durable and practical for using. - With reasonable design, these guitar string nuts are suitable for most of the guitars. - The delicate design and fine workmanship, make it an essential accessory for guitar. - The nuts can improve the guitar's sound, create a more beautiful sound. - It can preserve your guitar strings better, and it is portable and compact, convenient to use. Package list: 12 x Guitar Upper String Nuts