The Screw Lids Aka Travel Caps with Rewritable Sealing Disc. These travel caps are compatible with dr brown Wide Mouth Bottles, and have a bottle mouth compatibility of 1.77", making them the ideal choice for parents on the go. Our travel caps come in a set of four, so you'll always have a spare one handy when needed. These caps are perfect for those moments when you need to store or transport a bottle of milk or juice, without worrying about leaks or spills. The cap can also replace the natural bottle sealing ring and sealing disc, giving you extra peace of mind. These screw lids are designed with safety in mind. We know how important it is to keep your baby's bottle clean and free from harmful bacteria. That's why our travel caps feature a rewritable sealing disc which can be easily wiped clean, ensuring your baby's bottle is completely hygienic. Our screw lids are also a great alternative to traditional plastic bottle caps. They are made from high quality, BPA-free materials, making them safe for your little one to use. And at just the right size, they are the perfect replacement for lost or damaged bottle caps.