For nearly 300 years, the shaving brush has been an integral part of traditional shaving. As a necessary tool in shaving, it acts like a magic wand that prompts the shaving soap to produce smooth and dense foam, preparing everything for the razor to finally harvest the beard. . For shaving, a tool that is so important and has such a long history, there must be a way and an explanation.

Brush diameter (knot size) refers specifically to the size of the brush node base, which directly represents the size of a brush and the number of bristles, and is the core parameter of the brush. This can be determined by measuring the size where the bristles meet the brush handle. Except for the famous Wee Scot, the common brush diameter range is 21-30mm, and very few brush sections can reach 18mm or 32mm. 28 and 30 can be regarded as typical big brushes, while 21 and 22 are typical small brushes.

Brush length (loft) refers to the length of the bristles. There is no unified standard. Some use the length from the base of the bristle to the tip of the bristle, some use the length of the part of the bristle that extends out of the handle, and some use the vertical distance from the connection point of the bristle handle to the top of the bristle. Generally speaking, type 3 brushes are mostly used for brushes of general brands, and type 1 is more common for repair shaving brushes and craftsman-made brushes.

The shape of the bristles is divided into bulb, fan, flat top, and hybrid. The market is mainly dominated by hybrids and light bulbs. Some people prefer the fan shape, while the flat head basically only exists in DIY.

The handle materials are generally resin (acrylic), wood (the specific wood name is usually used in English), horn (the animal species is usually added), and metal (the specific metal name is usually used in English). Generally speaking, resin is recommended. The cost of cutin is high and deformation when exposed to water is unavoidable, making it flashy; wood is generally painted to be waterproof, but it cannot be completely isolated. There is still a phenomenon of deformation and cracking caused by the alternation of moisture and dryness, and the cost of high-quality wood is very high; metal is easy to slip after being stained with soap. , and some metal-resin combination handles are not made of aluminum, and the heavy handle affects the weight balance of the brush.

The production process is mainly divided into handmade and mechanism. The mechanism cannot achieve the density required by a shaving brush, so in the field of shaving brushes, handmade is the basic technology necessary, and it is not a very high-end method.

Brush material is mainly divided into badger hair, boar/hog bristle, horse hair, and synthetic fiber. As a shaving brush, this is naturally the most important difference, and it is also the basis and foundation of shaving brush classification.

Toughness (backbone), the ability to resist bending under stress and maintain straightness. The stronger the brush with this attribute, the better. It should be noted that some people call backbone rebound and describe it as the ability of the bristles to return to their original straight and straight shape after a short period of force. This is actually different from the original concept of backbone. In fact, it is easy to Bristles that are easy to return to their original shape even when bent are bristles with poor backbone.

The degree of softness/scritch is not an objective technical parameter, but it is also a common factor when commenting on brushes. It means literally, the softness of the brush and whether it is used for shaving. Softness is naturally good without affecting other performance.

Water retention refers to whether the brush easily retains water in the brush during use, or whether it stores very little water. Brushes with different bristles have different performance in this performance. Badger hair has a strong water storage capacity, while boar bristles have less water storage. There is no such thing as strong or weak performance. The degree of personalization is very strong, and it is better to match your own shaving habits.

Density, literally, refers to how tightly the bristles are tied, or it can also be understood as whether the bristles are dense enough. Generally dense is better, but too dense may cause the brush to become fluffy and spread out. Brushes with a relatively low density will be described as floppy, which is a typical negative description. Density mainly depends on the production of the brush and has less to do with the bristles themselves.

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