【Premium Material】Yoocaa’s collapsible metal straw is made of premium food grade 304 stainless steel but no any metal taste. FDA Approved, 100% BPA-Free, dishwasher safe, durable and environmentally friendly. 【Telescopic Design】reusable metal straw with case is telescopic, which is perfectly compatible with 10-40 ounce cups. Tight enough to avoid collapsing. 【Easy to Clean】 Each collasible straw comes with a collapsible cleaning brush which is long enough to clean the inside of the telescopic straw from top to bottom easily. It helps keep your straw in its pristine condition at all times.