@Dennis Wichter it’s a peat based starter plug used for propagation. I ordered this one rooted and acclimated from an auction for 20 bucks.

@Dennis Wichter that’s them. I’ve seen a few other brands. But those are the standard. I’ve found that they take a very long time to break down in soil. I’ve seen old ones resurface in soil beds. They must have some sort of binding agent. Just a heads up. They work great but I avoid them for in food crops propagation

Thanks for sharing!