Features: brand new and high quality Additional collars and transparent covers allowing mothers to seamlessly convert a storage container to a feeding bottle. for bottles. Air vent in teat must match with named logo on collar. Colors: There are 4 colors of collars to choose, pink, green, gray, and white. Directions for Use: 1. To remove transparent cover - push the transparent cover backwards (away from you) to open; 2. To assemble teat into collar - With the built-in anti-colic air vent facing you, place the collar over the teat and pull teat upwards through the Collar to fit snugly. Simply pair it with a teat flow of your choice to experience the convenience of a hassle-free conversion when it comes to feeding. Specifications: Material: PP Color: As Pictures Show Style: Transparent Cover/Pink Collar/Green Collar/Gray Collar/White Collar Size (Approx.): Cap-Height 4.5cm/1.77in Collar-Max. Diameter 7cm/2.75in Weight (Approx.): Collar-20g Cover-15g Package Includes: 1 Piece Cover or 1 Piece Collar (Pink/Green/Gray/White) note: 1.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!