Description: Hygienic, Easy Clean and use. Double roll ball 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. Spring fixed, metal spring fixed on the cage, not easy to be bitten by pets, lightweight and durable. It can be fixed in any place , such as walls, wood, cages, etc Pet Water Feeder perfect for hamsters, guinea pigs, rabbits, dutch pigs and other small pets. Specification: Material: Plastic + Stainless steel Capacity:125ml Not include Bevel mouth length :Approx. 17cm/6.69inch Bevel mouth:Approx. 4.5cm/1.77inch Bottle diameter length:Approx. 4.5cm/1.77inch Capacity:250ml Not include Bevel mouth length :Approx. 12cm/4.72inch Bevel mouth:Approx. 7cm/2.76inch Bottle diameter length:Approx. 6.3cm/2.48inch Capacity:500ml Not include Bevel mouth length :Approx. 21cm/8.27inch Bevel mouth:Approx. 7cm/2.76inch Bottle diameter length:Approx. 7cm/2.76inch Capacity:750ml Not include Bevel mouth length :Approx. 24.5cm/9.65inch Bevel mouth:Approx. 7cm/2.76inch Bottle diameter length:Approx. 8cm/3.15inch Color: As picture shown Package Includes: 1 Piece Small Pet Bottle 1 Piece Spring Note: Since the size above is measured by hand, the size of the actual item could be slightly different from the size above. Due to the lighting effects, monitor settings, etc. There could be some slight difference in the color tone of the pictures and the actual item.