I own like five pairs and love them. They're so cheap I bought a few just to keep in certain places so I always have them (one in my main backpacking pack, one in the truck, etc.) They've actually had a few slightly different versions over the years so I can't speak for what they're currently selling, but mine are 20oz for the pair.
They're not SUPER strong, especially at full extension, and I've broken one or two. But as long as you're careful they can easily handle tasks like acting as a stretcher between antlers to carry out a skull on a pack.