I have almost 100 year old hardwood floors that are painted very dark brown (Jacobean style) and I was hoping this brush roller would get into the gaps between the planks. Unfortunately, the fibers don't even seem long enough to get surface dust off the floor. A bit disappointed as it looks like a great accessory otherwise - the gray fibers are very soft and the black stripe is a bit more durable. I just wish they were 1/8 or 1/4 inch longer so they actually make contact with the wood floor.