Thirstystone 4 Pack Black & White Round Resin Coasters. Resin coasters are a popular choice for their unique designs. Resin is known for durability and can withstand wear and tear of daily use. Resin Coasters are heat tolerant allowing for hot beverages to be placed on them. Use these Coasters to protect your surfaces from scratches, stains, and water rings. Each Coaster measures 4.75” Diameter.