In a crowded bar or party, some people might be a little bit concerned about mixing up their beer with someone else's. But the folks at a Redwood City, CA, company called Sentilla apparently are concerned about mixing up their coasters.
Of course, the very fact these beer drinkers are couth enough to use coasters is a plus.
If you'd like to get a look at the coasters in action, just click on the video below. If you like what you see and want to build your own coasters, the step-by-step process is explained on Inventor Spot.
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