Oasis #81016 Green All Weather Bird Bottle W/Shield Guard For Birds 16 oz NWT Easy to mount with either wire bail, clip on spring r both for extra firm hold. This is a heavy duty polyethylene (pe) translucent "frosted look" bottle with good resistance to damaging ultra-violet light and temperature extremes. Use indoors and outdoors. Colorful green angled cap complete with stainless steel vacuum-valve drinking tube, two heavy stainless steel balls in ball-point tip, and rubber gasket. Holds 16oz, Measures 10" long with spout. New in package.