Scuba Cylinder Signal Ball, Diving Tank Banger Elastic Wide Application Loud Anti Slip for Outdoor Sport(Black strap + yellow ball)

Much Louder: Set on your diving cylinder, pull the ball, it makes a much louder sound than other diving equipment, practical diving accessories. Much Louder: Set on your diving cylinder, pull the ball, it makes a much louder sound than other diving equipment, practical diving accessories. High Elasticity: Strap part has high elasticity, that the hitting ball can be used on most cylinders of different sizes. Easy to Use: The knocker ball is easy to hold and use in underwater situation and environment, increase the possibility of being helped in special condition. Using Method: Put it on a diving cylinder, pull the strap in the water, and when you let go, the ball will hit the tank with a loud sound, making you easier to be heared by your partner or others.