This Bird Bottle is specially designed with a "Triple Ball Point" tip with a built in reservoir featuring a red nylon ball to attract birds. Two internal stainless steel balls add weight to the red ball to seal against dripping. The drinking tube offers a sanitary clean water supply that is not contaminated by seed, seed hulls or droppings. This bottle's unique construction and color prevents sunlight from damaging the water supply by preserving vitamins or predication potency and inhibits bacterial growth. The white floating ball inside indicates water level at a glance. Includes a U shaped mounting bail and coil spring mounting bail for secure attachment. Eight ounce bottle comes with a 5 year guarantee and is great for carriers and cages.