1. **What is Bio Gear?**
* Bio Gear adds another layer of strategy for **Boxing Star X** players.
* All Characters can equip **one Bio Gear** at a time.
* Bio Gear cannot be equipped by multiple [Characters](/game-system/character.md) simultaneously.
2. **Upgrading Bio Gear**
* Players must possess a certain number of the same Gear to upgrade some Bio Gear.
* Certain Bio Gear requires special parts to upgrade.
* **Bio Gear** can only be **Upgraded** and cannot be **Graded Up**.
3. **Bio Gear Max Level and Mileage**
* If a player's Bio Gear reaches Max Level, any further upgrades will be converted into **Bio Gear Mileage**.
4. **Bio Gear Options**
* The **Main Option Value** increases as the Bio Gear's level rises.
* The **Fixed Option Value** does not change, even as the Bio Gear's level increases.
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