No. 583 Thank you for viewing! [Product Details] Color: Silver Size: Inner diameter 8mm, opening 3.5mm (can be slightly widened) Width 3.5mm Suitable for both men and women! Surgical stainless steel 316L material Also used in medical devices, it is a material that is unlikely to cause allergies. This is a no-brand product. I will do my best to accommodate your requests, so please feel free to comment! We have other products available, so please take a look!