These stainless steel coop cups are more hygienic than plastic as they are less prone to scratching damage and bacteria build-up. They are easy to remove for cleaning and stainless steel is generally a long lasting safe material.
They come in four sizes:
Small - 7.5cm wide and 4cm deep and holds about 150ml
Medium - 9.5cm wide and 5cm deep and holds about 300ml
Large - 12.5cm wide and 5.5cm deep and holds about 600ml
Extra Large - 15cm wide and 6cm deep and holds about 900ml and the extra bonus is it is big enough to act as a bird bath for smaller birds.