Feature: 1. Firm in Fixing: This screw can firmly fix the cello bow string, so you will find your cello playing much easier, very practical and reliable. 2. For Adjustment: Moreover, the screw accessory can easily adjust the cello bow string tightness, ideal for both performance and maintenance. 3. Including 2pcs: There are 2pcs different cello bow screw, which will surely satisfy your needs for replacing old and damaged cello bow screw. 4. Metal Material: Mainly made of premium metal material, the cello bow screw replacement is not likely to deform, and durable for long term use. 5. Easy to Install: Comes with a compact size and a light weight as well, the convenient installation can be quickly completed within minutes. Specification: Item Type: Cello Bow Screw Material: Metal. Package List: 2 x Cello Bow Screw