E-Z Nurser prevents "gulping" and helps lambs gain weight faster right from the start. The bottle, fashioned of a special plastic with pint markings, won't crack or break and lasts indefinitely. It's light and easy to clean and sterilize. Lamb Nipple is rubber with cross-cut opening and air hole which prevents vacuum and promotes flow. Complete Nurser includes 2-quart bottle, screw-on cap and lamb nipple.