NUK First Choice Glass Bottles are designed to be used with First Choice+ Latex Teats. These teats have a specially designed orthodontic shape and extra wide lip support to simulate breast feeding as closely as possible. The teats are shaped to mimic mothers nipple during breastfeeding, which reduces confusion and encourages latch on. 6 pack. BPA free. Anti-colic. Wide neck bottle. Medium flow teats. Nuk anti-colic air system reduces the risk of infant colic. Supports breast and bottle feeding. British dental health foundation approved. Eco - glass is durable and long lasting and can be recycled at the end of its usable life. Latex teats are biodegradable and can also be recycled. Bpa free. Manufacturers 2 year guarantee.