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What are silicone bottle caps made of?

They are available in a variety of colors, styles, and materials.

Some silicone bottle caps are made of polyethylene terephthalate (PET), a polyethylene terephthalate (PET), which is a silicone material that helps to prevent water from leaking. Some bottles caps are made of other silicone material, which helps to prevent water from leaking. Some reusable silicone bottle caps are made from high-quality silicone material, which helps prevent water from leaking.