Using our eco - friendly walnut shells for molded plastics is easy. First, if you're using them as a filler, add the custom - sized walnut shells to your plastic mixture according to your needs. They're great for both decorative and functional purposes. For research and development, we've provided sample products for you to test. When it comes to storage, keep them in a dry place to maintain their quality. Since they're not chemically processed and free of heavy metals and asbestos, they're safe to handle. Just be aware that the sizes are based on U.S sieve standards and the millimeter and inch measurements are approximate. If you have any special requirements for the size, let us know and we'll custom - produce them for you. And because they're annually renewable, you don't have to worry about supply shortages. These walnut shells can help reduce the weight of your cast parts, so take advantage of this feature when creating your products. You can use them in a wide variety of items like countertops, gun stocks and more. Enjoy creating with our walnut shells!