Oasis Dura-Pearl water bottles are unique translucent coored water bottles. These high quality PET bottles have an up-scale look look good on any cage and are long lasting. Recommended for indoor use or in protected areas away from direct UV light. Dura-Pearl bottles have coordinating colorful caps with high quality stainless steel drinking tubes and two heavy stainless steel balls in a ball-point tip and rubber gasket. 8 ounce size is suitable for hamsters pocket pets some reptiles baby rabbits and guinea pigs and for travel cages.