Review on 🥃 Premium 6-Piece Drink Coasters with Thin Cork Bottom - Moisture Absorbing Stone Coasters (Set of 6) - 4 inch Large Table Protection for Cups & Glasses - Scratch & Stain Prevention by Natalie Adams

My last rating is based on a few days of use. I've found them to be useless and not worth buying as they don't absorb moisture and glass condensation for more than 20 minutes. Then they start to stick. Broke two that had already slipped out of my glass. I put them all in the hot sun for a whole day thinking it might help - no sir - same thing after 20 minutes with the condensing jar. One guy had a review saying it's just sand from a painting - and they work better. It's unfortunate because I liked the design and one of the reasons I bought them. I will try it and let you know in another review.