Designed to complement the unique glazes of Denby's Imperial Blue range, the Denby Colours Blue Set of 6 Coasters are the perfect colour statement for the table. The Imperial Blue collection has been established for over 30 years. Length: 10.5cm, Width: 10.5cm, Depth: 5mm Material: Cork Back. Dishwasher safe: No. Heat Resistant: to 60 degrees. Wipe Clean with a damp cloth.