Features: Suitable for multiple brands of bottles, ensuring easily integration with your existing feeding equipment. Make milk storage more convenient and suitable for novice parents to easily use at home or when go out. Food grade PP, easy to clean, ensuring safety during milk storage. Innovative sealing design effectively prevents leakage during milk storage. Lightweight design, easy to carry, without adding extra burden. Specifications: Component: PP Type: large, small Size: Large size is suitable for wide/standard diameter 5cm/1.96inch 4-tooth bottles, small size is suitable for standard diameter 3.70cm/1.45inch Practicality: Easy to store breast milk, prevent pollution and leakage, suitable for home use and carry out Package Includes: 1 Piece Baby Feeding Bottle Sealing Cap note: Other accessories demoed in the pictures is not included. Multi brand suitable, some brand models are not compatible. If you have any questions, please contact us! Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution.