SEIRIN needles undergo eight strict quality controls during production. The needles are cleaned electronically and sterilized with EO gas. The acupuncture needles are centered in the handle for comfortable handling. High resistance to bending. The ergonomically optimized and precisely centered handle for safe and comfortable handling. The needle itself is precision-manufactured from special stainless steel. It is diamond-ground at the tip, triple-polished and finely coated, making insertion particularly easy for the therapist and virtually painless for the patient.