Flexi Royal Guelph Pans- Replicas of original copper molds from the 18th century, era of Ernst August, King of Hannover and Duke of Cumberland (1771-1851), obtained at a Sotheby's auction at Marienburg Palace in Germany. Made of 100% flexible platinum cross-linked silicone. Maximum non-stick performance. Heat-resistant up to 500 degrees. Cold resistant to -76 degrees. Microwave-proof. Fruit-acid resistant. Hypoallergenic. Dishwasher safe. 15 year guarantee