place the tip of the balloon over the sports cap. glue the bottom of the cap onto the middle of the CD. Now twist open the sports cap and blow into the balloon from the bottom of the CD. Once the balloonis infiland, twistshut the sports cap. Now place the CD on a flat surface and release the sports cap. The CD will will glide accross the surface ona cushion of air, much like a puck would in air hockey.