Beautiful handmade resin coasters-set of 4. Broken shell in watery blue tinted resin. These coasters are sturdy, 4 inches in diameter and 1/2 inch thick. Because they are handmade, and resin has a mind of its own, variations occur. The variations add to the beauty of the item, highlighting the hand crafted quality. Food safe and heat resistant to 135 degrees. Care: Hand wash as needed in warm soapy water and dry with a soft cloth. As a resin artist, I recognize that this is not the most eco-friendly medium. To balance this, I do my best to minimize waste during production, use recycled or compostable shipping materials when possible and even recycle some of the shipping materials I receive in products I order to pack some of my shipments, while still keeping the packaging and unboxing a pleasant experience. I hope you see this as a positive process of environmental responsibility.