Emery sand is used it tiny pincushions to sharpen pins and remove burrs. On commercially made tomatoe pincushions, that little pepper or strawberry is fill with it! Make your own! Emery sand is also very dense and weights more than you would expect! We are selling packages of about 2 teaspoons, which weighs about 20 grams.
We also have Ground walnut shells with is a great media for regular pin cushions!