You can see some environment-related marks on the side of valve oil containers.
Green Mark: A mark regarding the recycling and reproduction of sales packaging in EU countries.
Plastic Mark: A plastic identification mark based on the Containers and Packaging Recycling Law to encourage separate collection of plastic containers and packaging.
The bottle is made of polyethylene terephthalate (PET), the cap is polypropylene and the inside plug is polyethylene.
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