The ROS design introduced a realistic oral cavity structure — complete with teeth, tongue, uvula, and a natural inner color. However, limitations such as lip-to-teeth misalignment, facial distortion during mouth movement, and difficulty opening the mouth led to less-than-optimal user experiences.

ROS MAX solves these issues with five major upgrades:

• Optimized Oral Positioning
  The lip position is now better aligned with the teeth, allowing the mouth to open naturally — exposing the upper teeth slightly while keeping them hidden when closed. The result? A soft, seductive “gasping” effect when opened.
• Strengthening Eye Socket Structure
  A new movable internal structure behind the eyes prevents facial deformation when the jaw moves, preserving the natural look of expressions.
• Improved Mouth-Opening Mechanism
  The redesigned lower jaw provides more defined resistance when pressed. Simply apply gentle pressure to the chin, and the mouth opens gracefully — elegant and precise.
• Head Weight Reduced
  ROS MAX heads weigh approximately 2.5 kg, which is 20% lighter than the original ROS heads (about 0.5 kg reduction). This makes them easier to handle, photograph, and position.
• Dynamic Lower Eyelid
  The lower eyelids are now movable. By gently pressing them upward, users can create a semi-closed eye effect — perfect for capturing the dazed, pleasure-soaked expression known as “Ahegao.” ( Note*: Use fingertips only. Avoid sharp objects or nails to prevent cosmetic damage.)