These wheels were easy to install. Just pop the old ones out and pop these in. They allow the chair to glide over the floor very smoothly and quietly, without marring the floor. Well worth the money.These wheels are the greatest thing in the world, in the world, I have a hardwood floor and now my chair rolls easily no fighting no locking up exactly what I wanted.I have porcelain floors and these wheels are awesome!! Great quality!!!The wheels are great and the chair moves so much better now, only downfall is it moves a little bit to easily. My daughter gets upset when she's sitting in the office chair st the desk and it rolls back on herThe price was great, and it is so easy to put on, it is probably harder to get the old ones off than put the new ones on, and they are soooo wonderful and smooth. Great product.For years I always bought rugs to go under my office chairs to protect my hardwood floors. And one day my friend mentioned I could change the wheels to rubber rollers! What?!? These were the perfect solution. It rolls smooth, quiet, and doesn’t hurt my floors. I’ve replaced several chairs in my house with these. I wish I knew about these soonerI recently install used reclaimed wood floor which is a little lumpybut these wheels make a positive difference.Easy to roll over my lump wood floor.Love these wheels. My office has carpet but the wheels still glide across the floor with no problem. Highly recommend this item