There is a rubber missing. Please check the photos and purchase with your understanding. 【High-Quality Material】 The KUN mini violin shoulder rest is made of durable plastic and can withstand long hours of use. 【Comfortable Playing】 The ergonomic design provides comfort during playing and reduces the burden on the player. 【Adaptability】 It is compatible with 1/8 to 1/4 size violins, making it ideal for growing children. - Brand: KUN - Model: Mini Original - Size: 1/8-1/4 - Material: Plastic - Country of Manufacture: Canada Thank you for viewing.