This is the Mares Training Scuba Instructor Float Features: Four outside handles for pre-dive preparation Ample inside space to contain the line during transportation External pocket with zip Oral inflator and over pressure valve Stainless steel D-ring for to connect the free diving line 12 holes for water drainage Training is the new freediving buoy from Mares. With handles for pre-dive preparation, an internal pocket and a D-ring to connect a freediving line it is the perfect buoy for apneists!