Feature●With over pressure valve to rapidly remove air when needed and accidental over-inflation during ascent from expansion●With loop handle , with stainless steel D- and lifting strap at bottom for slate attachment●2 Pieces heavy duty technical scuba diving 50lbs desinged with reflective stripe, high visibility, lightweight, compact and durable●Special design means more air to keep the stable in the water●Perfect for salvage projects and also can be used as a marking buoy for decompression or safety stops in theDescription