Heavy duty glass water bottles for your bird by Lixit. Water bottles help keep your bird's water fresh, clean and sanitary. Rounded thick wall glass water bottles are dishwasher safe and have a one piece tub cap with ultra vacumm seal. Stainless steel tube with double Bail-Point tip and a delux spring connect clip make these water bottles a snap to use. Use the 8 ounce and 16 ounce size Lixit water bottles by resting them on a horizontal cage bar on the outside of the cage and holding in place with the metal spring attachment that comes with the bottles. These models of Lixit water bottles may not fit the large parrot cages with larger size cage bars as the attaching clips may be too small to fit the bars. Bottles are round.