It broke when I tipped over on my bike. I didn't even know that it had broken until it clunked down and was interfering with the pedaling action. It must have a name but I can't find one online to order. Seems like not such a big deal, but it did prevent my leg from getting greasy when I ride, plus it seemed a bit of a protection from those pokey bits on the gear.
Tipping over was just a dumb thing I did. I don't even know what I was doing, I think I was trying to reach down and check my tire pressure on the front tire - while slowly riding on my driveway...or maybe I was feeling the front brake pad. I don't know why I didn't stop and do whatever it was I was trying to do, silly. And before I knew it I was falling, unable to stop it. I was okay. The bike thingy broke.