Material: slate.

Color: gray.

Diameter: 10cm.

Thickness: 4mm.

• CLEANING INSTRUCTIONS: Water will leave marks on the surface of a slate. We recommend sealing your slate with a sealer. This is because the slate surface is dry and when it is partially wet, the moisturized part will stand out from the rest. if you don't use a sealer please hand wash only by soaking the dirty slates in 1 part of bleach with 3 part of water for 1 hour. Then air dry. 
• STABLE & DURABLE: A non-slip soft bumper is installed at the entire bottom of every single coaster. It provides stability and prevents accidental spills, scratches and messes on your tabletop.
• ONE SIZE FITS MOST: Each one is of 4’’x 4’’ in size, which will fit coffee mugs, wheat glasses, stout glasses, beer glasses, wine glasses, and shooter glasses. Prevent condensation from leaving any stains or watermarks on your countertop, bar, or tabletop surface
• NATURALLY OCCURRED MANUALLY CRAFTED: They are handcrafted and designed with genuine black slate, direct from natural charcoal! Each piece has a unique, hard and rugged pattern. Because a completely symmetric coaster set would be boring!
• RAW HANDMADE LOOK: Make your dinner table or bar stand out with these gorgeous black slate coasters.