A good inexpensive saddle kit for your kayak. They are not adjustable in any way and other reviewers marked them down because if this, reasoning that the saddles don't conform to the shape of a kayak hull. I've used mine for several trips with a plastic kayak and have had no problems with denting. I can move the rack bars on my Thule tracks to adjust the saddles to the shape of my kayak, strap it down snug and have had no negative issues.
I have a pair of Yakima Land Shark's paired with a pair of Thule Set 'n Go saddles on the other side for a second kayak, a nice combo that works well, but the Thule Topdeck saddles are just as good and cost less. Go for it. It's simple and it works.