Now you can easily change colors in seconds with these Auto Air bottle adapters. Designed for suction feed air brushes, these eliminate the need to clean up cups and bottles at every color change. These fit all Auto Air Colors 2 ounce and 4 ounce bottles. Each includes air tight cap, so you can leave them in the bottles so they are ready to use when you need them. Packaged 12 per bag., includes bottle lids, air tight caps and cut t o length straws.