WMF Cromargan® Stainless Steel Straws: Sustainable Alternative. Plastic straws are one of the biggest polluters of our oceans. Say goodbye to them forever with WMF's stylish set of reusable stainless steel straws. Their durable design prioritizes the environment and your health. Made from premium stainless Cromargan® 18/10 steel, which is tasteless, odorless, BPA-free, and lead-free material. These reusable straws are 100% safe for your health and the environment. They are also unbreakable, scratch-resistant, and rustproof - ideal for use in any situation! Dishwasher-safe metal straws are easy to clean and completely hygienic. A convenient cleaning brush is also included.