The stainless steel metal straw is telescopic, which is perfectly compatible with 12-40oz cups. Each telescopic straw has one case and one cleaning brush. Straw can be placed in an aluminum alloy case after shrinking, light and small, fits right on your keychain, in your pocket, purse, backpack, or briefcase, even on your belt loop. The foldable straw is BPA-Free, FDA Approved, plastic free, reusable and environmentally friendly, non-toxic and does not leave a rubbery or metallic after taste, perfect for you to enjoy any cold or hot drink. It is a really flexible safe straws for kids. Our reusable folding straws come with collapsible steel brush cleaner, you can clean the inside of the reusable straws from top to bottom easily. Great gift choice for your kids, family and friends.