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Thermoplastic elastomer TPR is a kind of rubber with high elasticity, high strength, high resilience, and has the characteristics of injection molding, environmental protection, non-toxic and safe, wide range of hardness, excellent colorability, soft touch, and weather resistance.
TPR is used in masturbators because the material is softer than silicone and, for most, will result in a better experience. They are making a product that consumers want and are willing to accept a limited lifespan for.