This is a breastfeeding bottle made of heat-resistant glass. It has been opened, but is unused. I purchased several breastfeeding bottles during my pregnancy, but I only needed one, so I am selling the unused ones. The nipple is size M. There is also an instruction manual. - Brand: Pigeon - Model Name: Breastfeeding Bottle (母乳実感) - Capacity: 240ml - Target Age: 3 months and up - Material: Heat-resistant glass Please comment if you have any questions. Thank you for considering purchasing this item.