Topco Sales duotone balls

Relevant topic analysis on Ben wa balls:

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According to Topco's product page, "Vibe and balls are waterproof and phthalate free" link

Beyond that, I can't find any information about what they're made of, either. Try contacting the Admin or even Topco for more information about materials. Looking forward to that review!

From seeing them in local toy shops, they look like a rubber-based material.

Use Eden Link and ask a question of either Desiree or Tera, both have been great at questions.