Didn’t want to put too many details in the question for privacy sake. Knew a guy with your name in college, was curious if you were the same. Have a great day!

You wouldn’t happen to be Burke from CS, would you?

Likely durability and portability. Think of it as something they use month over month and just mark the day with something like a string band. Bone would be light enough to keep with you, strong enough to not break, and common enough to be available for household use.

Same, was always a Kim stan.