Did you heard Emery Mineral before ? Or do you have tomato pincushion come with cute little strawberry? This strawberry is not part of the decoration. It has Emery Mineral inside for keep your pins and needles clean and sharp. Emery Mineral is a very hard crushed rock, used to make abrasive powders and mixed with other species. It's very heavy. There are two kinds of Emery Grain at the market:Natural and synthetic . Natural Emery Minerals had been made from natural rocks and Synthetic emery grains produced in factory,not mined. Synthetic Emery Mineral's life much more short from natural one. Natural Emery Grain has sharp sides that help needles stay sharp.