Ordered these for use in a Dyson laptop which had the original filters previously cleaned but not replaced. These filters work well. The primary filter is actually a little tighter in the filter housing than the original filter, which sometimes fell out when the unit was upside down. The final filter also sits well and can be securely fastened by turning it with little effort. The difference in performance is very clear. Much more suction at the end of the stick, especially when using a small brush head. More air comes out through the rear filter. There's a button on the rear filter to turn the handheld on and off, but unlike the Dyson original, it doesn't light up. These filters fit and work well. Three per pack means you won't have to go long without changing the filter.
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