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For blowjob sex dolls, critical contact zones—such as the lips, tongue, and inner oral lining—should be crafted from ultra-soft platinum-cured silicone (with a hardness approaching 0A), paired with an internal gel layer to achieve a "proactive enveloping" fit. The primary objective of this material upgrade is to ensure both visual realism and an enhanced sense of physical enclosure through soft, adaptive deformation during use.