Scuba diving SMB surface marker buoy with safety reflective tape,high visibility, strong, long lasting and durable. Surface Marking Buoy makes sure scuba divers can be seen in open ocean. SMB can be filled using the oral inflator, or through the use of a inflator at bottom, you can also use standard BC hose to inflate. Built-in over pressure relief valve allows the tube to without rupturing. Aluminum alloy finger spool anti-corrosion, lightweight, durable and works for flat diving lines under 18 meters in length The finger spool is empty and ready for you to add your own choice of line Great gear equipment for cave diving, technical diving activities and a wide variety of diving applications. Specification: SMB: Material: Nylon 5FT:Size:(L x W):Approx. 150 x 15cm/5ft x 5.9inch Color: Fushia Dolphin Finger Spool: Size (Outer Diameter x H): Approx. 5.5 x 3.5 cm / 2.17 x 1.38 inch Inner Hole Diameter: Approx. 2.5 cm / 1 inch Color: Blue Package Includes: 1 Scuba Diving Finger Spool 1 Piece Surface Marker Buoy Note: Please allow slightly difference due to manual measurement. Color may be slightly different since different monitor. Thanks!