as the title says. what are they for?
In: Engineering
This one’s a bit difficult to sum up. It is a pressure thing due to the pressurized can.
[This link describes the beer can ball](https://www.businessinsider.com/plastic-ball-guinness-smoothifier-widget-ads-nitrogen-2015-9)
I am currently drinking a beer, and it is exactly the way that the thousands before it to touch my lips from dozens and dozens of different brands- completely “marble”-less. Michigan is known for microbreweries and craft beers, and I have a hobby of experiencing them all- Served with nitro, co2, from the can, from the bottle, with fruit, chilled, room temp, etc. I have no idea what marble you’re talking about. I have not tried many foreign drinks so it’s possible everything outside of Michigan uses a marble for some great reason we have not discovered.
I’ve never heard of a marble in a beer can or a tube of icing. Perhaps it’s a local thing?
It allows to seal the can/bottle airtight while keeping it reusable. With the marble, you don’t need an external airtight lid or a destructible can opening. Just pop the marble and off you go.
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