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Material: Unknown composition
Sex toys makers are not obligated to mention the exact composition of they prducts. Some of them remain very vague about it, therefore sometimes, the composition of a sex toy remains unknown.
Some patented sex toys materials, despite having a name, don’t give us any clue about their composition.
Same thing for thermoplastic elastomers (a blurry name for polymers with elastic properties) and for jelly, which (usually toxic) composition varies according to the inspiration of its makers.