【Compatible】Compatible with Dr. Brown wide-neck baby bottles. Please note: This is an aftermarket product made by Giftophilia 【Baby Safety Comes First】Crafted from safe, food-grade polypropylene (PP) that’s BPA-free, ensuring worry-free feeding. Dishwasher safe on the top rack, and can be sterilized in boiling water for added peace of mind 【Perfect Seal】Featuring a removable silicone seal ring, this lid ensures a snug fit with baby bottles, effectively preventing leaks. It's ideal for travel and storing formula or breastmilk 【Easy to Clean and Use】The simple design allows for effortless removal and cleaning, keeping everything hygienic and hassle-free. It’s hand-washable, machine-washable, and can be sterilized in boiling water 【Versatile Use】 These bottle caps are perfect for taking your baby’s bottles on the go and storing them in the fridge, ensuring convenience wherever you are