They are very tough. It is the same material Honda makes bumpers out of.
When Honda first introduced the "plastic" decks we had one on the sales
floor along with a 3lb mall and many many people hit it as hard as they
could. It eventually got badly marred up but no one ever cracked it.
I've had a Harmony 215 for about 6 years now and it's in great shape,
no cracks, etc. It's a very tough durable plastic. And I highly
recommend the Honda Harmony's. Really great machine, trouble freee,
and does an excellent job of mulching.
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