Description: Double buckle design, more firmly fixed. Hygienic, Easy Clean and use. Ball valve design, the pet tongue licks the ball to the top, the water is exposed, and the water does not move when the ball is not licked. Transparent bottle allows easy checking of water level. Suitable for Rats, Degus & Guinea Pigs,squirrels,rabbits,ferret,chinchilla and so on. Specification: Material:Stainless Steel+Plastic Pipe Length:6.5cm/ 2.56inch S Size(Dia.xH):Approx.4.8x22.5cm/ 1.89x8.86inch Capacity:180ml L Size(Dia.xH):Approx.5.8x23.5cm/ 2.28x9.25inch, Capacity:350ml Package Includes: 1 Piece Pet Water Bottle Feeder (4 Pack) Note: The plastice bottle must be filled with water, otherwise it will leak due to lack of internal pressure. Put the water bottle to block the water outlet, shake it up and down several times to empty the air at the front of the water outlet. In the first few minutes, the natural water drop is normal. When the pressure inside and outside the bottle reaches a balance point, it will stop naturally. Due to the manual measurement, there is a slight difference between the size from the above and the actual item. Because of the displaying and lighting effects, monitor settings,etc.there could be a little color difference acceptable, please kindly note.