PVC plastic is an environmentally friendly material, non-toxic and odorless. The bottle holder is stable and does not shake, allowing you to move it away and changing water easily. The triangular food container is cute and convenient for putting or changing food. The bottom vacuum can be placed on the water bottle or the cage . 3 in 1 feeder for hamster, have three functions for hamster: drink water by water bottle, eat the food in the feeder, and rest in the small niche.