This is my fault, but be sure to check the vacuum cleaner model you are ordering parts for. We have a Eufy RoboVac 30C Max and I didn't realize the 30C parts didn't fit the 30C Max. It was only when I ran out of filters from a previous order that I tried one from this group and found it didn't fit. It's long past the return date so I don't have the $20. I blame myself, but I also blame manufacturers for giving their products deceptively similar model numbers. This parts company is not at fault because they clearly stated which models the parts fit and this customer made an assumption that turned out to be wrong.