how to clean? Easy to clean, just wipe with a damp cloth to clean slight soiling,and put it under running water to clean the toughest of the , then wipe dry or blow dry for your next use. Do not put it washed in Dishwasher or washing machine What are the dimensions are this placemat? The Placemat is approx :18 x 12 inches. Package Including: 4 x Placemats/6 x Placemats. Tips: 1. Please use the water under 60 degree,use fine brush to brush, rinse with water dry up in the shade to cool. 2. Do not touch the steel balls and other hard objects. 3. Do not machine wash in the microwave, exposure and so on. 4. Do not put more than 200 degree items on the placemat.