The DSB 3.9 Semi-rigid Inflatable Boat is a robust, heavy-duty Inflatable Boat, the skin and buoyancy tube of which are made out of ultraviolet-light-resistant Hypalon and neoprene. It has independent air compartments and safe, flush integrated valves. Accessories, such as reinforcements, handles, rope sets etc., can be customised. The heavy-duty 3.9 Semi-rigid Inflatable Boat is available in versions with wooden or aluminium floorboards and is fully equipped. Customised boats are available in a number of versions that include Inflatable Rescue Boats.