First, acupuncture needle from the length (pointer body) has commonly used specifications: 13mm (half inch), 25mm (one inch), 40mm (one inch and a half), 50mm (two inches), 60mm (two inches and a half), 75mm (three inches).

25mm, 40mm, and 50mm are commonly used!

Two. Acupuncture needles are divided into common specifications and special specifications.
The commonly used specifications are: 0.25mm, 0.30mm, 0.35mm

What tube is carried, as shown in the following figure, is the tube that helps the beginner to enter the needle