Features:Bone material (unslotted)， durable and compact.4 pieces in 1 pack.Can be used to create nut for string instrument.Will come out with a pretty good sound.Specifications:Material: Ox boneProduct size: Approx.52 * 9 * 6mm / 2 * 0.3 * 0.2inProduct weight: 6g / 0.2ozPackage size: 8.7 * 6 * 0.6cm / 3.4 * 2.4 * 0.2inPackage weight: 23g / 0.8ozPackage List:4 * Bone