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might not be as rugged as a glowring (since they're not intended to be knocked around)

Did you even bother to follow the link I gave?

From the site:
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Amazing new markers are waterproof, explosion-proof, vandal resistant, require no batteries, no electricity, no maintenance and last up to 15 years

Do the glowrings make a similiar claim?

I don't want to make a big deal about this, but I resent the implication that I, or labsafety are somehow doing something illegal. Since the website clearly indicates these things ship directly from the manufacturer, I'm pretty sure the manufacturer would know what's legal and what isn't.