This 2-Pack of Playtex Silicone Ventaire Nipples is designed for wide bottles and a fast, stage 2 flow. The bubble-free system prevents air from entering Baby"s intestinal tract, and it fills rapidly to accommodate a growing appetite. A wide base and raised, textured area promote proper latch-on, and they ease transition between the breast and bottle. The nipples are specifically designed for use with Playtex VentAire wide bottles only. Top-rack dishwasher safe. Package weight: 2 oz.