Violin Chin Rest - Barber Type Material: Ebony (Indian Ebony) Due to being the hardest material, it is said to provide clear sound quality and have the effect of focusing the resonance. The thickness of the center part is approximately 22-24mm. It can be used in various situations, such as for those who find the maximum height of their shoulder rest insufficient (longer neck), those with sloping shoulders, and those who want to play with their shoulder adducted (shorter neck). The protrusions are smooth, providing good hold and making it less tiring for long practice sessions. There are two types of metal fittings: gold-plated and silver-plated. The metal fittings of this product are gold-plated. Please check the photos at the time of purchase.