very hard metal bristles
586875
The brush is made of metal strands and I found it to be pretty sharp. My cat didn't really like being brushed with it. Something a little softer would be ideal.
4717853
This brush will take the rust off but it vibrates so bad it will put your hand to sleep, because it is so out of balance
993739
Stout, and will no doubt do the job- but very rough, both in the casting and the "finishing;" in quotes because it isn't finished. Rough grinding abounds, with no apparent attempt to clean it up. In 40 years of buying similar items, I've never seen anything rougher. Spartan, utilitarian, but not polished. Yes, that is where a lot of labor resides, and it shouldn't affect the function- but it does affect the perception.
2777207
Thought the idea of this brush was great. Brush all 3 sides at once. .. front, back, and bottoms of the teeth.
However I found it to be very bulky. My dog who dosn't mind getting her teeth brushed at all, minded it very much with this product. Also I thought the bristles were very hard. I only used this item 3 times before I threw away.  I was afraid of hurting her gums!
we went back to a regular tooth brush.
maybe if you have a puppy your starting out with  and training them to get their teeth brushed this might be ok.  Just remember the bristles are harsh
3925504
Works good for fine dust collection but not good for metal grindings, will catch on fire with hot metal shavings. Connection on the smaller 5 gallon units is not great with its slip on over nozzle fit.
4067388
No problem with the product themselves, just that these are not soft I expected, I believe they are quite harsh bristles and it hurts my gums.
2434936
This brush is perfect for corners, around steps, and return jets.  However, there is a serious flaw.  The bristles are made of a very low grade "stainless steel".  The bristles break off easily and will leave rust stains on the pools finish if not vacuumed up at once.
2308922
Way too "hard". I wouldn't use this on delicate surface or many other surfaces for what they say it is safe for.
2311772
Heavy, metal shavings magically appear after month of use
536147
These bristles are flexible and so easily bend around trim and other details, but the material is NOT very soft. The bristles feel exactly like those of a cheap paintbrush--scratchy plastic. The ends of the bristles have been sanded or squished to "soften" them but they are not soft like a quality brush. The bristles look like sun-damaged hair. There was a LOT of nylon dust in the brush when it arrived and had to be washed out several times.

This brush is no softer than a similar brush I got at Costco several years ago. I prefer that one since the bristles wrap around the sides of the brush, which makes washing the car easier, faster, and less damaging.
382429
The brush is hard to work with but still gets the job done.
1401885
This is definitely not flexible.  It is bendable but it will not "follow" the contours of something as you push it through.  For example, if the hands holding the brush in the picture of the product were to let go, the brush would stay in exactly the same shape.  It would NOT straighten out.  I was hoping to use it to clean the overflow of my bathroom sinks which are  plastic tubes.  Unfortunately, the bristles on this brush do not continue to the end of the brush and is just a sharp piece of metal at the end.  Given that it is not very flexible at all and that the end is sharp, I would NOT run this through a plastic tube because it would NOT conform as you push it and it would likely pierce the plastic.
So if you need a narrow brush to clean something that has strong walls, this will probably do the job, but beware that the end is not bristled but is about 1/2 inch of hard pointy metal.
755075
The bristles are little plastic sticks.  I thought they were metal.  I know this will not last long.  It works ok as long as things are loos on the turf.
457789
I bought this brush in a large set of Alfie products and though the brush works well it's not for someone who is going to use it often. I am a professional groomer so I use it on at least 6 - 10 dogs a day and after a while the metal pieces started to bend and get stuck underneath the piece that moves out to clean the brush off.
1418610
If you are looking for soft brushes stay away from these. These are extremely stiff, they don't bend! Maybe they are to be used on wood or something cause i cant see it being used on paper or skin or anything soft.
1603874
I didn't expect the bristles to be this hard. When you rub this over your scalp it will hurt your skin under your hair. The scalp is as sensitive as any other skin on the body, this brush leaves marks on visible skin and I know that it will hurt your scalp eventually if you continue using this.
1439958
These brushes aren't bad for the price but the bristles bend much too easily with very little pressure applied. The bristles need to be much stiffer. While they are inexpensive, I don't expect them to hold up for very long at all. I will be looking for a much stiffer bristle next time I'm in the market even if that means paying substantially more.