They don't stick on thicker pile carpet/rug. But are perfect for indoor/outdoor or commercial carpet. I was able to use the fuzzy velcro pieces to get them to stay on thicker rug. Also can use a chalk marker to write on them if needed. It stays well but washed off easily.Works great for me carpet spots :)Perfect for what I needed them for. Have lasted nicely so far.These are great quality sit spots. The quality is not an issue at all.My problem is that the spots I ordered are a different color than the picture. The "Grass Green" pictures show nylon sit spots that are a lime color. I was expecting spots like one on the right (which came from my classroom), but I got spots that look like the one on the left. It's a great color, but it doesn't match what I already have and I'll be returning it.These held up for the duration of the school year, and will be able to be reused next year as well. They stick to carpet really well, so I didn’t have many students try to move them.We needed these spots for our kids programming to help designate seating that was at least 6ft apart. We'd previously been using stickers (got too dirty) and poly spots (didn't stay in place), but then we found these and they work perfectly.They're small enough to be non-intrusive, but the color helps them stand out so kids can easily see where to sit. We use them on multiple carpeted surfaces. In two locations, we've had them down on the floor for several weeks now and not a single one has moved. In another location, we need to bring them up each week and put them down again, but they've proved easy to bring up (I had been concerned they'd pull the carpet up, but they don't) and put back down. They're just as adhesive as they were when we opened them.Highly recommend these as an easy, affordable solution for when you need a non-intrusive, yet still visible, place for kids to sit!I bought these to help my first grade students keep their desks lined up. I also use some of them as "placement markers" on the floor so I can strategically place students during carpet time. I also use them as markers for standing in line. They are VERY durable. They stick GFREAT to the floor. You can't vacuum them up. That being said, they are so strong that they are a little hard to pull up, so be sure you put them right where u want them. You don't want to hassle with pulling them up very often.These worked well for what we needed. They stay well on the carpet, even while vacuumed, and are easy to pull up if they need to be. I’d expected them larger—they’re only about 3 inches wide— but they still work as markers for our preschoolers to know where to sit, so I’ll take it.Disappointed with this product. They look alot bigger on the photos than they actually are. The diameter is less than 10cm. I've tried them on my carpet at home as well as on a rug with different length pile and they move really easily and so I can't see them staying put during carpet time in class. Advert photo shows a vacuum going over them implying that they won't move even with a vacuum going over them. There is no way that this is true. I would not recommend these at all.