Each mobile is made of two 9" long interlocking arms of 1/8" clear acrylic. The Ballerina Mobile comes with 5 ballerina ornaments in your choice of colors. The Ornament Mobile has 5 dangling hooks which can hold 5 of our Laser-Etched Ornaments. These mobiles make beautiful light catchers when hung near a window. Recommended for Indoor use only. Some simple assembly required.