Thirstystone 3-Pack Heat Tolerant Cork Trivets. Cork Trivets are a popular choice for protecting surfaces from heat, moisture, and scratches. Cork is a natural material that is created from the bark of cork trees, making them a sustainable and ecofriendly choice. Cork is naturally absorbent to absorb condensation from cookware and to protect your surfaces from scratches, stains, and water rings. Package includes 3 Cork Trivets that measure 7.75” diameter.