Made of FDA- approved, food-grade polyethylene plastic, this bottle is sturdy and sanitary. The poly is durable yet translucent enough so you can see the content level. The nipple is made with a special rubber formula to prolong the life of the nipple and improve pliability. Handy snap-on top. The bottle is 4.25 inches square and 10 inches high and holds 2 quarts. The nipple is 1 inch in diameter and 4 inches long.