areas of high stress are reinforced for long term durability. computer-modelled design of the shoulder rest ensures the support and stability, which can prevent the violin from falling off, eliminate the pressure on your chin and neck. It's the perfect for beginners and , kids and adults. Great for practicing and playing the violin when you 't to disturb your family or neighbors. Compatibility: 3/4 and 4/4 violins Material:Plastic + rubber colour:black Package Contents: 1 * Violin Shoulder Rest 1 * Violin Practice Mute Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.