This is a tough nipple that can withstand aggressive nursers yet is soft and pliable. Made with a special rubber formula for long life and improved pliability. Fits the Little Giant 2-Quart #104957 Snap-On Nursing Bottle. *Soft, pliable rubber nipple *Tough enough to withstand aggressive nursers *Special rubber formula for long life and improved pliability *Fits Little Giant 2-Quart Nursing Bottles *1 inch diameter by 4 inch long