Texture of material：
Body: flexible polyethylene rope， polypropylene，
Lock: Poly formaldehyde resin
Size:
XS- ultra small (neck circumference 18-26cm)
S- small (neck circumference 27-33cm)
M- medium (neck circumference 34-44cm)
L- large (neck circumference 46-57cm)
XL- super large (neck circumference 54-68cm)