These signs are made of metal and have a very strong stake. We have had some up for a couple years which have been hit by construction trucks and were slightly bent but not bad at all - they really have held up and we have just put them out again. We just ordered 2 more due to additional construction on our street. While they won't stop someone from driving on the grass and hitting sprinkler heads, I am sure they help draw attention to where the curb ends and our grass begins and cuts down on the damage to our yard. Well made and a polite way of asking people to be careful when parking in front of our house.
The signs look fine and they appear to be relatively sturdy, thus a good deal for the price. The reason for the 4 stars instead of 5 is that the upper right corner of my signs were bent slightly upon delivery. This could be attributed to the flimsy cardboard packaging, and/or the USPS delivery methods.