Features:1.Heavy duty free-diving buoy training safety float with inside inflatable bladder, lightweight, wear-resistant, sturdy and portable.2.High visibility surface marker buoy makes sure scuba divers and free-divers can be seen in open ocean.3.Large opening on the top with zipper and loop tape fastener closure, the compartment can be used for storage of dive flag, pole, line, reel and other necessities.4.With 5 stainless steel D-ringon the bottom and around the buoy to connect the free-diving line.5.With over pressure relief valve and oral inflator, can use standard BCD or just by your mouth to inflate.6.4 Loop handles around the buoy for pre-dive preparation, bottom mesh design for water drainage.7.Designed with dive flag pole holder hole.8.Great for instructor, free-diving, scuba diving, beach diving, snorkeling, spearfishing, etc.Specifications:Material: nylonWeight: Approx. 1875gColor: As picture shownDiameter: Approx. 70cm/27.6inPacking List:1 x Diving Buoy Marker.