This Pet Republique 3 in 1 grooming brushes are assembled in a rotational mechanism that operates by a push of button. The Deshedding Brush to remove dead fur from your cat and dog. The Dematting Comb for clearing tangles and knots. The Pin Brush is suitable for daily grooming to smooth out the coat and remove any small particles like a flea comb. Most grooming tools on the market are too large for small dogs, cats, or sensitive areas. This tool is small enough to work more efficiently and safely than regular tools. The tool is very compact; measuring 3-1/2 inches in diameter. It is very convenient for traveling and carrying around. When you buy any product from the Pet Republique, we will donate a portion of profits to local shelters in the US, where rescued abandoned dogs and cats are homed and loved.