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<http://schema.org/description>
"Our uniquely designed coasters are made from actual slate stone with natural edges. Slate is one of the most durable, naturally-occurring stones which makes for great long-lasting coasters.\n\nSizes may vary slightly.\n\n \nSpecifications\n4 small round protective foam pads on each coaster\nMaterial: Slate with food safe scratch resistant coating.\nDimensions: 4\"x 4\" x 1/4\"\nColor: Charcoal Grey slate with light grey laser engraving\n\n\n\nCare Instructions: Wipe off with a damp sponge or towel. Dish soap is optional. Use a drop of food grade mineral oil twice a year to help protect the integrity of the slate and maintain a slightly polished look."
<https://giftedhandsgifts.com/products/pittsburghese-slate-coaster>