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