I have one Creek Company ODC 816 pontoon fishing watercraft. This design has a light aluminum rowing frame a seat with backrest, oars, aluminum rowing frame, and 2 8 foot pontoons. You pump up the air bladder in each pontoon. Two way pump is included. It is about 8 years of ages. Get made use of about 5 times each year. The bladders are in excellent shape and will hold air all day long.