1) Made of 100% silicone rubber, approved by FDA 2) Used in microwares or traditional ovens. silicone flower cake mould muffin mould1) Made of 100% silicone rubber, approved by FDA2) Used in microwares or traditional ovens3) Non stick, does not grease the mold.4) Aslo can be used as ice cube for funny design.5) Excellent quality and competitive price.