Crosize 3 Pack Rubber Door Stoppers for Floor, Door Stop Wedge for Heavy Duty Door, Black

Great!

These are nice and small, lightweight, however I used this for a classroom heavy wooden door on tile. The door stops are hollow in the middle, it's just a wedge shell, so the bottom has very little surface contact with the floor, so these slipped unless I really jammed the wedge under the door, and even then they would flex to flatten out and slide anyway because what little base there was no longer set firmly against the floor. I have to reposition these three to four times to get them to hold the door, if it all. Any dirt on the floor or wedge wouldn't allow it to hold, I'd have to pick it up and rub it with my hand to remove it and try again. This was not very effective seen I propped the door open only our 5 minute transitions, 5 times a day. Hated dealing with these door stops. I will note, they would probably work much better on carpet which would have more friction.

They work fine

I've used this on and off for like 3-4 years now, in a few different apartments. They work (as long as there is enough clearance under the door for the minimum height - which isn't always the case!) and are still holding up, but they've definitely gotten some sun damage over time. It doesn't affect how well they work or anything but they do look a bit worse now.

Best door stoppers I have ever used. At first I thought they were too big but they fit under any opening despite the size. I've been using them for a long time but there's been no obvious damage to them.