Good value, they are inexpensive and do the job. I go through a lot of these to cover the pages of my kids' exercise books so they can use dry erase marker over and over on them. These are thick enough to use for that purpose.
I am very happy with my purchase of these sheet protectors. Great price for the quantity. I wasn't sure as to the quality of them when I placed the order but was very happy and they work very well for presentations. I am able to fit several pages into each sheet which some other brands do not allow the extra room for this. I would definitely buy again.