I'll try to find the KD buoys, but if someone has a link, please post. I've kept a course up on a public (Lake Martin, AL) for over 20 years and no matter what you get, they all fade, get slicky, small holes in the tops or just leak. I bet the same factory in China makes them all. I'd also bet they cost less than $1 to make, but you've probably have to get 10K of them. I appreciate the guys who have invested in stocking and supplying them. BTW a bucket cut around the top makes a good measuring ring for smaller turn buoys and larger boat guides.
I prefer Orange over Red, red can be hard to see depending on light, angle,etc.