Plastic. Not exactly stylish. But my toilets are original, build quality, and clog easily. After trying different types of plungers, including expensive ones and those with bronze bowls/handles rubbed with oil, I have found that accordion-shaped, funnel-shaped plungers are the most effective. (I had the orange one, which looked so ugly and didn't have a container; I had to put a Tupperware container underneath to collect "stacks" after use.) In contrast, this flask is discreet. Just hide behind the toilet. If a guest or family member needs a flask, trust me they will find it. I especially like that there is a container to put it in after use. (Much more hygienic.) Not sure how long it will last as it's plastic but probably longer than rubber which tends to dry out and stop working. regret it.
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