Boyesen are the brand.
Reeds are a valve.
They come in all sorts of flavors.
Carbon fiber, metal (spring steel?), fiberglass, pumpkin spice.
Each has their pros and cons, a metal reed snaps off and gets sucked into your engine, you can imagine how that's gonna be less than ideal. A carbon fiber one gets sucked in and your engine will eat It for breakfast, spit it out, and ask for more like nothing ever happened.
Reeds are basically a check valve that open and close depending on pressure. Stops everything you just sucked in from the intake from being pushed back out. Two strokes are amazingly simple in how they operate and that's what makes them so wonderful. I have smaller 2T motors in bikes that don't use any reeds at all. No crank case induction either. They run just fine and scoot you around at 40mph ta boot.
Learn the mechanics on how they work and you'll see how great they are for the novice "home gamer" to work on.