1. Heavy duty freediving buoy training safety float with inside inflatable bladder, lightweight, wear-resistant, durable and portable 2. High visibility surface marker buoy makes sure scuba divers and freedivers 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. Attached with 3 stainless steel D-ring on the bottom and around the buoy to connect the freediving line 5. With over pressure relief valve and oral inflator, can use standard BCD or just by your mouth to inflate 4PCS TPR handles and 4PCS nylon handles around the buoy for pre-dive preparation, bottom mesh design for water drainage Unique internal ball fixing belt, so that the internal ball no longer wanders. Large resin zipper, not rusty, easy to pull, not easy to damage. Great for instructor, freediving, scuba diving, beach diving, snorkeling, spearfishing and more colour: yellow Material: TPU Package Contents: 1 x Freediving Buoy 1 x Flag Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.