Geospace Super Sonic Gyro Disc with Sounds & Lights (Assorted Colors) A fun and stimulating challenge: First, grab the two cord handles Spin (wind) the disc away from you: this stores kinetic energy in the twisting nylon cords Then quickly pull the handles away from each other repeatedly The energy in the cords is released, causing the discs to spin Watch the sound & light show! Try to control the speed!