Instructions for this product:Product Name: violin seat belt cover fully adjustable violin support cushion 1/2 3/4 4/4 universal, 1/8 1/4 universal Material: PlasticColor: BlackSize: 1/8 1/4: 20cm*3cm/7.87*1.2in1/2 3/4 4/4: 15.5*3cm/6*1.2Description:Comfortable curved, soft foam eliminates neck pain when playing. Rubber feet protect the violin surface from scratches. Both the height and angle are fully adjustable. As a longtime favorite of students and professionals, this violin rib provides a sturdy and comfortable frame. Intensive filling, comfort and stability. Durable and fully adjustable. A good assistant for you. Thanks to it, your shoulders will not be tired or painful during training. Both the height and angle are fully adjustable. Note:1. Due to manual measurement, please allow 1-3cm difference. Package Included: 1pc