If your Mantis tiller's tines are worn out or broken, these are the official replacement blades you need. They're the patented serpentine design that Mantis is known for – they're awesome at slicing through hard, compacted soil and even clay. They'll till down to about 10 inches deep and 9 inches wide. A cool feature is they're reversible, so you can flip them for shallow cultivating work (like weeding) about 3 inches deep. They fit most Mantis tiller and cultivator models, but they are NOT compatible with the Mantis XP, 3550, or 3558 models – just double-check your machine first. They come in that classic red color. Just swap out the old ones, and you'll have your little tiller digging like new again.