The Image Disk creates a rotating image chamber for your kaleidoscope by joining two clear glass domes! The unique design lets in maximum light for an exceptionally brilliant image! The Image Disk copper-foils together in minutes and can be filled with scraps of glass, beads, jewels, or just about anything. The package includes two 2½” diameter glass domes with center holes, mounting eyelets, and instructions. It mounts easily on the axle of Clarity’s Mini-Scope, Spiral-Scope, and Aeroscope, or can be mounted on your own kaleidoscope designs.