Oasis Crystal-Clear water bottles are heavy duty clear as glass plastic bottles. These high quality PVC bottles have plenty of sparkle look good on any cage and are long lasting. Recommended for indoor use or in protected areas away from direct UV light. Crystal-Clear bottles have a colorful silk screen design with a coordinating colorful angled cap. The drinking tube is high quality stainless steel with 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.