Cutters & cutouts in the photos are in the S size.
This set comes as 3 cutters.
Cutter for butter: Square nano
Cutter Base Measurements:
S - 25 mm (0.98 in)
M - 35 mm (1.38 in)
L - 45 mm (1.77 in)
XL - 55 mm (2.17 in)
All measurements are taken of the bases' exterior dimensions, rounded off to the nearest decimal.