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Sharing Something About Brush Ferrules:

The ferrule of a makeup brush is the metal tube designed to hold the glued hair as well as providing a 'gateway' or connection for the handle and the hair.The most common for metal tubes or ferrules for makeup brushes are made of brass, copper or aluminum. Brass is the strongest of the three.

Although ferrules are described as aluminium ferrule, this is rarely the case for makeup brushes as pure aluminum metal is impossibly soft to use hence 'Aluminum ferrule' can refer to aluminum alloy, which is aluminum mix with other metal, hence can be just as strong.

Whatever the metal used to make the ferrules, they should be double crimped and seamless to avoid the risk of annoying wobbly handles sometime down the track. Also, most quality makeup brushes have ferrules that are usually nickel-plated for appearance and corrosion resistance. Some also have gold, black or other colored coating. Ferrule opening sizes or diameters usually can give indication as to how big or how much hair is used in a makeup brush.