The quality of the needles are of the up most importance. Manufacturing facilities with strict quality control must ensure proper packaging and sterilization. All packages must come with a lot number and expiry date. They must be stored in a cool, dry space and handled with proper Clean Needle Technique.
Needles are made with surgical stainless steel. The are strong yet thin, filiform and flexible. They should have low nickel content. This reduces the reaction of those with metal allergies.
The gauge and thickness of the needle is also taken into consideration. With each insertion, the Acupuncturist senses “de Qi”, or the arrival of Qi. The client will feel it as a heaviness or dull ache. The smaller the gauge the more sensitive the therapist is at finding de Qi. A smaller gauge is also used for more sensitive people and points on the body.
Acupuncture needles should be single-use. After the removal of each needle, it is placed in a bio-hazard container and disposed of properly. The safety of both client and therapist is always at the forefront.
I hope this may have answered some of your questions. Feel free to comment or ask me any further questions.