This is a Japanese Wire Choker in Red Color.
(NE2291828) Japanese Wire Choker 18 Strings, 316L Stainless Steel Clasp (Red)
Material: Japanese Wire
Clasp: 316L Stainless Steel Clasp
Size: 18 Strings (1mm/strings)
Length: 18 inch (45 cm)
Remarks: To open clasp, first push clasp together, then twist and finally pull clasp open.
Pendant fit:It will fit any pendant with a 2.5mm hole size bail.