All items have been sterilized by boiling. Only two bottles were used once for testing, but they are almost unused because they didn't suit the premature baby's mouth. Cross-cut nipples can be used for any age. Set of 4 transparent glass baby bottles with a star pattern, 240ml capacity. - Quantity: Set of 4 - Color: Transparent/Green - Capacity: 240ml - Design: Star and stripe print - Material: Glass Thank you for looking.