These may not be the only silicone coasters on the market and they may be a bit more expensive than some, but they work! The coaster "doesn't stick to the glass" - so often the coasters float up with the glass and then fall with a crash to the ground. These stay in place. And they stay in place no matter where you place them on your desk (or whatever) - they won't slip. In general, they are unobtrusive, useful, and work.
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