Elevate your pleasure with the Gemoria Collection, where elegance meets innovation. This glow-in-the-dark plug features a built-in rolling steel ball, providing motion-based stimulation and a uniquely dynamic experience. Key Features * Built-in Steel Ball: Contains an internal rolling steel ball, delivering intense stimulation with every movement—whether walking, shifting, or engaging in active play. * Unique Stacked Design: The graduated, double-layered shape allows for gradual insertion and increased stimulation as you progress. * Glow-in-the-Dark Capability: Glows bright green after absorbing light, creating a visually playful and exciting experience.