The K&M 13800 is a premium black velvet seat cushion designed to add extra comfort to compatible K&M chairs, stools and benches. Made from soft, high-quality velvet with durable, supportive padding, it enhances seating comfort during long rehearsals, lessons or performances. The cushion attaches securely and maintains its shape well over time, offering a simple yet effective upgrade for musicians who want added comfort without compromising posture or stability. Ideal for orchestras, studios, teaching spaces and home practice environments.