Save your table from those pesky H2O (water) rings! These geeky coasters feature the first 20 elements of the periodic table and are printed on high quality coaster board that is very durable even though they are disposable. The coasters measure 4" x 4" in size. Perfect for your next lab get-together, science conference, mad science birthday party, graduation, retirement party or science-themed event. Makes a good teacher / professor gift too!
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