These 9 x 12 inch bases are weighted with a 3.5 lb. steel plate.   This enables remarkable stability for up to 5 flutes in any combination - standard C Flute, alto flute, bass flute, as well as soprano flutes, irish flutes and whistles.  Choose a design that best reflects your surroundings, and customize to fit your flute selection.  Because of the extra weight, these stands are best suited for a "stay-put" situation, such as your home or teaching studio.