The self-sealing BUDDY SMBCi (Surface Marker Buoy - Closed with Inflation Cylinder) features a lightweight aluminium mini-cylinder (choice of 0.1 or 0.2 litre) which is mounted at the foot of the buoy just above the internal baffle. Available in Bright Red, HiViz Red & Yellow, or as an all-Yellow Signal Buoy. Simply attach a line or reel and you have a superb decompression marker buoy and also a buoy that can be used as a standard surface marker.