Description: Full diving set- 1x scuba diving surface marker buoy (SMB) + 1x aluminum alloy finger spool + 1x safety whistle Surface Marking Buoy makes sure scuba divers can be seen in open ocean; the whistle is a great survival tool for emergency situation 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 The finger spool reel with 30m/98ft high visibility line and attached with a stainless steel double-ended bolt snap clip Stainless steel swivel connector to prevent line entanglement and twisting and unique flared design allows ease of winding with gloves on under cold water Great gear equipment for safety scuba diving, snorkeling, spearfishing, cave diving, technical diving activities and a wide variety of diving applications Specification: Surface Marker Buoy (SMB) Material: Nylon + TPU Size (LxW): Approx. 0.5x5ft/15x150cm Diving Finger Spool Material: Aluminum Alloy + 316 Stainless Steel Spool External Diameter: Approx. 6.5cm/2.55inch Spool Thickness: Approx. 3.5cm/1.37inch Center Hole Diameter: Approx. 2.5cm/1inch Line Length: Approx. 30meter/98ft Line Thickness: Approx. 0.2cm/0.07inch Bolt Snap Length: Approx. 9cm/3.54inch Safety Whistle Material: ABS Plastic Total Length: Approx. 13 cm / 5.1 inch Whistle Length: Approx. 5 cm / 2 inch Width: Approx. 2 cm / 0.78 inch Height: Approx. 2.2 cm / 0.86 inch Package Includes: 1* Surface Marker Buoy 1* Diving Finger Spool 1* Safety Whistle Note: Please allow 1-3mm differences due to manual measurement