These 2 quart capacity nursing bottles are made of strong and durable polyethylene. Nipples are made from a special rubber formula to prolong nipple life and improve pliability. Our most popular model features a high quality snap-on nipple with vacuum air vent. Size is 2 Quart. Dimensions are 4.25 X 4.25 X 13.5 Hdpe High Density Polyethylene Plastic. UPC Code = 084369098120