Mould Sea Sisters 6x10 Decor Moulds™ IOD Décor Moulds™ These are a result of collaboration between designer and sculptor. Now even larger, and made from high quality, food grade silicone, your moulds will bring you joy in your creations for years to come. Used with IOD air dry clay or your choice of mediums, Decor Moulds add a sculptural and textural element to any of your projects!