Finally - the music stand storage musicians have needed. The box dimensions are 10" long by 6" wide and 2-1/2" deep, so it will hold all the supplies and accessories you need - pencils, valve oil, mouthpieces, rosin, cleaning supplies, reeds, you name it - at a convenient location right below the music stand desk. It has a built-in holder for your water bottle or cup as well. The hanger is designed to fit on any Manhasset music stand and provide a securely fitting container unequaled for accessibility and convenience. Can be installed in an instant and removed just as easily.