Ocarina airway the width of a popsicle stick

#anythingbutmetric

Was reading how to make a wooden #ocarina out of curiosity and boredom, and I think the airway should be 1 cm? Seen popsicle sticks vary from 1 to 3 cm so far, including from a specific brand with varying widths in a same stick, and I don't see how more space would fit the mouthpiece.

Still, every other measure so far used a standardized unit, usually in inches and the sort, so the "Popsicle stick" unit caught me by surprise. e.e"

Sauce of the article:
https://www.instructables.com/How-To-Make-A-Wooden-Ocarina/