S 项圈1.5cm宽,脖围24-33cm,拉带1.5cm宽,长度180cmM项圈2.0cm宽,脖围32-48cm,拉带2.0cm宽,长度150cmL 项圈2.5cm宽,脖围48-73cm,拉带2.5cm宽,长度120cm