Three sizes available:
S: 5.6 x 4.5 cm / 2 x 1.5 inches (Length x Width), opening 3.3 cm / 1.5 inches
M: 6.1 x 4.9 cm / 2.5 x 2 inches (Length x Width), opening 3.3 cm / 1.5 inches
L: 6.7 x 5.4 cm / 2.5 x 2 inches (Length x Width), opening 3.6 cm / 1.5 inches
The length measures across the center, parallel with the opening. The width measures across the center, starting from the middle of the opening.