What is the name of the girl's collar? The collar was really played by Japanese girls this time.

Sm neck female metal tie M-shaped men's and women's round neck without M-shaped metal collar+sending storage bag+sending chain to pull male metal collar stainless steel specifications are as follows: collar: wall thickness: 6mm collar width: 2cm inner diameter: female 12cm male 14cm without hollow M-shaped collar: wall thickness: 5mm.