(1) Needle is made of medical grade stainless steel. Individually packed. For disposable using only?50 oblique needles? (2)Superior quality and complies with international cosmetology and medical requirements (3)Suitable for all kinds of handmade pens, more stable, less vibration, excellent stability. (4)Sterilization certified by Gamma Ray, Needle is made of medical grade stainless steel. (5)30-DAY GUARANTEE ¨C if you're not satisfied with your purchase for some reason, contact us for a replacement or refund.