Women's metal collar with the letter m.
Male metal collar without M-shape
Women's round neck+send storage bag+send chain traction
Men's metal collar
Stainless steel specifications are as follows:
Collar: wall thickness: about 6 mm.
Collar width: 2cm
Inner diameter: female 12cm, male 14cm.
M-neck without hollowing out: wall thickness: about 5 mm