Sara Miller Chelsea Collection Set of 4 Placemats in Green - each large placemat measures 30.5cm x 23cm and is made of thick 5mm board, to ensure longevity. The coating is stain and heat resistant up to 100°C and each large placemat has a cork backing to protect furniture and work surfaces. Wipe clean with a damp cloth. Part of the Sara Miller Chelsea Collection - an enchanting collection that's bright and beautiful with stunning gold detailing. Sara Miller is an award-winning British designer who expresses her passion for travel through her art.