Better than sandstone
Reviewed by Oregon Water from Oregon on Monday, May 18, 2015
I bought a set of sandstone coasters a few years ago because they looked really cool - but yes, they're made of sand and have slowly dissolved and scratched my glass-top stands. These coasters seem very well-made and are quite sturdy. Thickness is approximately 3/16" (5mm), which makes them stiff and (probably) durable....time will tell. I went with fish, image is exactly as pictured.