Our silk is food-grade and completely safe for contact with coffee and water. It’s made from 100% unbleached mulberry silk—no metallic weighting, no dyes. Unlike traditional silk processed for the fashion industry, ours is cleaned and woven straight from the cocoon, with minimal intervention. It’s also pesticide-free—after all, why would we use chemicals on such delicate creatures? Mulberry silkworms are highly sensitive to additives, even in the leaves they eat, which means the silk they produce is as pure and natural as it gets. Just be sure to give your filter a quick clean before the first use.