The 8" foam ball has a medium density, thick vinyl cover and can be thrown, kicked and bounced just like other foam balls. The beeper is encased in a hardened module that slides into the ball and generates a loud, sharp beep. Ideal for limited vision classes or use blindfolds with sighted players. Module can be removed and used without the ball. Operates for approximately 170 hours on one 9V battery. Battery not included.