Item Type: Diving Surface Marker Buoy Material: Nylon Size: Length: Approx. 124cm/48.8in Width: Approx. 15.8cm/6.2in Applicable: For Safety Diving, Snorkeling, Spear Fishing and Other Underwater Activities in Large Equipment. Package List 1 x Diving Surface Marker Buoy Manual measurement please allow some errors. 1Practical to Use: The diving inflatable nylon buoy ensures that divers can be seen in the open ocean. 2Safety Assurance: The diving surface marker buoy has a builtin overpressure safety valve that allows the pipe to rise without rupture. 3Unique Design: With safety reflective tape for high visibility and ruggedness. Mouth valve design (oral inflation only), but very effective. 4Essential Tool: The diving surface marker buoy is a necessary life saving tool for divers, similar to the role of a swimsuit. 5Convenient to Use: The main function is to float on the water surface for alerting the incoming and outgoing vessels. 6Widely Used: The diving safety signal tube is suitable for safe diving, snorkeling, spearfishing and other underwater activities.