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 screw-on top. Bottle is 4.25 inch square by 10 inch high holds 2 quart. Nipple is 1 inch diameter by 4 inch long.