It’s to keep them stable/bottom heavy. Lots if panicked mums returning their cups now, though.
Edit @Greenbank has corrected my misunderstanding:
Stanley say a lead pellet is used internally to seal the vacuum installation. I'm guessing because it has a very low melting point. https://www.independent.co.uk/life-style/health-and-families/stanley-cup-lead-poisoning-b2484881.html
Stanley say a lead pellet is used internally to seal the vacuum installation. I'm guessing because it has a very low melting point.
https://www.independent.co.uk/life-style/health-and-families/stanley-cup-lead-poisoning-b2484881.html
https://www.independent.co.uk/life-style/health-and-families/stanley-cup-lead-poisoning-b2484881.html
@Greenbank started
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It’s to keep them stable/bottom heavy. Lots if panicked mums returning their cups now, though.
Edit @Greenbank has corrected my misunderstanding: