Size	Head cricumference(A)	Height(B)	Ear width(C)	Rough standard weight
S	30cm (11.81inch)	11.9cm (4.69inch)	4.7cm (1.85inch)	1.5〜6kg (3.3~13.2lb)
M	35cm (13.78inch)	13.9cm (5.47inch)	5.5cm (2.17inch)	6〜12kg (13.2~26.5lb)