Diving flag: across the world recognized diving flag with greater resistance to stop the flag from folding or falling within the wind making improvements to visibility on the surface Printed: Personal security, the diver below indicates the diver. The allows people to search out their location easily Inflate or deflate fast: fast blown mouth, 5-10 breathing can also be full, easy to make use of after use for rapid storage Material: The PVC used for this buoy is thick and environmental friendly, with highly resistant to the stress of maritime activities Sand hole: the sand hole on the bottom, can also be filled with sand to mend the sphere and keep the ball vertically