I have been a little wary of buying 3rd party replacement parts for my Eufy Robovac 30c but all the parts in this kit are virtually identical to the original parts. I replaced all three brushes and all three filters and gave free rein to my golden retriever living room. I can honestly say that the amount of fur harvested has increased by 50% as a result. I suspect that performance degrades so slowly over time that it's easy to overlook. My guess is that the new filters brought the suction back to the original suction level, which was a major factor. didn't know what it was for or just didn't get it in their shipment. If you look at the photos I have included you will see that I did in fact receive one and understood its purpose for removing fur and/or hair from a horizontal brush. Bottom line, I will definitely buy this item again. =========== EDIT, Four weeks later: After replacing the main roller brush with the one that came with this product, I experienced multiple disconnects and "Roller Brush Stuck" warnings. In each case, nothing was tangled in the brush and the brush was free to rotate. I have to say it's quite frustrating to come home expecting the floor to be cleaned and to find this bug long before the job is finished. Today we had this error twice in the same cleaning cycle. I have never experienced this problem with an OEM roller brush.
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