Includes set of 4 red slate coasters. All slate is washed and treated with a food-safe sealant. Thickness variable, but measures at least 0.3". To clean, wipe with damp sponge or towel. In order to preserve your slate, wipe it down with a drop or two of food-safe mineral oil about twice a year. Mineral oil helps protect the integrity of the slate and maintains a slightly polished look.
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