So your Roomba casters are broken and you're looking for new replacement parts. You checked the price of a new kit from the manufacturer and laughed at the price. You found this listing, you looked at others, you read (scary) reviews to find out if it's worth buying "cheap" parts, right? Well that was me and I'm here to tell you everything you've read about them being LOUD, not fitting properly and everything else being 100% correct. Now I'm going to tell you how to get the most out of this purchase as you probably will after reading this. Let's say you haven't thrown away your old broken casters yet. When they arrive and you change them, test them around the house, they will be noisy and very rattling. don't trust me Paste them in. Now that you've done that, take them out. If you compare these two sets of wheels side-by-side, you'll notice that the manufacturer's wheels are about 1/4 inch longer than this one. That's what makes this horrible noise. All you have to do is use a manufacturer's hard plastic roller carriage and add the new cheap silicone rollers you bought from this list and all your worries are over. To do this, you can remove the roles from the carriage and swap them. They are difficult to remove, but pull and they will come off. If your old ones are stuck, cut them off, they're junk anyway. new rollers on the manufacturer's bottom bracket and don't forget to put the end pieces back on and you're done. Place your newly made Frankenstein Rollers in your car. So, would I buy these cheap skates again? Absolutely. Am I disappointed that it isn't? right match? Absolutely. That's why I'm rating this 3 stars because it's really poor performance on the cart, but the silicone rollers are all I need, so I'm happy to pay a lot less for them and swap them out myself. It would be less wasteful and easier for me if they only sold roller skates, but I get what I get. Have a nice day.