Non stick & awesome
I bought these for my daughter, I have had mine for a few years & use them for my Yorkshire puddings & muffins regularly, nothing has ever stuck to these beauties, threw out my metal muffin trays. I have learnt to put them on an oven rack, then pour in the batter and carry the oven rack across to the oven as they are very flexible to carry. It also saves me from using paper muffin holders so environmentally friendly. Love, love, love them.