The most important factor in any tattoo machine is the quality of construction and the type of materials used. Tattoo machines tend to last longer when they are made of stronger metals, including iron, brass and copper. These conductive metals help ensure that a tattoo gun does not crack or break mid tattoo.
To determine the size of tattoo machine you need, consider the type of machine that will best suit your needs. Some tattoo guns are made only for needle sizes that create lines, while others are made for needle sizes that are used in shading. Some guns can accommodate both types of needles, while many companies sell smaller lining and shading guns in combination packages. The physical size of the tattoo gun is also important because some guns are heavier and bulkier than others.
Other elements of a good tattoo machine include the proper power supply for the tattoo gun, a clip cord and a foot pedal. Some companies sell starter kits that include power supplies, clip cords and pedals, and these can be considerably cheaper. The design of your overall setup is important as well because the length of the cord on your foot pedal can affect your comfort and movement.
Another important factor in choosing your tattoo machine is to consider the amount of tuning your tattoo gun will require. Tattoo guns intended for use in professional settings tend to require less tuning, while tattoo guns that are made to use both lining and shading needles may require more frequent tuning.