XS 9.5cm x 7.5cm - slides on to a 2cm wide collar.
S 11cm x 8cm - slides on to a 2cm wide collar.
M 14.5cm x 10.5cm - slides on to a 2.5cm wide collar.
L 16.5cm x 12.5cm - slides on to a 2.5cm wide collar
Collar sizes :-
XS 26.5 - 34cm length / 1.9cm wide
S 29cm - 39cm length / 1.9cm wide
M 33cm - 43cm length / 2.5cm wide
L 38cm - 48cm length / 2.5cm wide
XL 45cm - 58cm length/ 2.5cm wide