The product is a used 4/4 acoustic violin case made by Karl Willhelm, featuring a durable hard shell with a soft blue velvet interior. This case is designed specifically for violins with a maple body and four strings, providing protection and storage for the instrument. The lightweight design makes it easy to carry and transport, while the brown color adds a touch of elegance. Made in China, this violin case is a reliable and stylish option for violinists looking to keep their instrument secure and protected.