Features The shoulder rest can be adjusted to fit 3/4 or 4/4 violins. With thickened soft pad design, the non-slip shoulder rest is comfortable to wear. Made from rubber and stainless steel, the shoulder rest, violin mute, and strings are very sturdy and durable. The violin mute is great for violin practicing if you don't want to disturb other people. The strings can be reserved for exchanging when you encounter an emergency of a sudden string breakage. Specifications Color: Black Material: Rubber & stainless steel Shoulder Rest Size: 20 * 6.8 * 1cm/ 7.8 * 2.6 * 0.3inch Shoulder Rest Weight: 57g/ 2.01oz Mute Size: 5.3 * 2.6 * 1.2cm/ 2.1 * 1 * 0.4inch Mute Weight: 16g/ 0.56oz Package Size: 20.5 * 7.3 * 4.5cm/ 8.07 * 2.8 * 1.7inch Package Weight: 103g/ 3.6oz Package List 1 * Shoulder Rest 1 * Mute 4 * Strings