It wasn’t unbreakable, but didn’t claim to be. Definitely didn’t shatter.
Non-Shatter
Tag: does what it says on the tin
Mirror Spacer
Simple. Effective. Does what it says on the tin.
Who can argue with that?
Variable Star Observations
“Observations of Variable Stars by the American Association of Variable Star Observers”
One would expect there’s no better-qualified group for the task.