The silicone egg poaching cups by Cornucopia Brands are constructed of BPA free food grade silicone. Silicone is made of polymers of silicon ,carbon hydrogen, and oxygen, all natural ingredients. It has low chemical reactivity, repels water, and is resistant to ozone, oxygen, and UV light, PLUS it doesn't support microbiological growth, and has low toxicity. It is tasteless, odourless, non-toxic, non-leaching & non-corrosive. Consensus: Silicone is a great product for the kitchen and the environment. Brighten up and add luxurious style to your kitchen with non-stick, brightly colored silicone utensils with multiple cooking and food serving functions. Welcome to contact with us if you'd like to place bulk orders,we surely will provide you the most competitive prices. Note: The color of actual items and computer display photos may be varied slightly from the above images. Please allow 1-3cm(0.4-1.2 inches)error due to manual measurement.