They are generally made of sandstone which absorbs water. If your drink does fog up, the coaster will soak it up instead of spilling it on your table. I thought it would be a great idea because my computer desk is glass and I didn't want to use a regular coaster and wash the rings off it every other day. Advantages 1. These are mostly sandstone stones, polished in the form of a stand with a rubber holder. There's nothing complicated, and I appreciate it.2. The gum is removed from a piece of sandstone. This makes cleaning easier when needed.3. Sandstone absorbs liquids.4. They just look cool. Disadvantages1. They absorb liquid, but not always very quickly. Every now and then a small puddle may form on the surface. That's actually not that bad, because the sandstone will drink it up at some point, but maybe not as quickly as desired on particularly warm/wet days. 2. I have no doubt that these things will break if I drop them. Oh well. Overall I am happy with my purchase. I've been using it for a few weeks now and haven't had any problems. They look cool, work as intended, and are easy to clean and maintain. That's basically all I wanted.
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