Wayne22 is probably right about the earlier version of the H-9 floats. I had a set on my Cub that split along the bottom after about 50-60 landings. The 2nd set I have on now seem to be a bit more sturdy. No reason they shouldn't last you quite a while as long as you don't slam them into the water. I have more than 250 flights on the 2nd set with usually several touch and goes on each flight and they are holding up just fine.