Special quality fuel tank sets for the CD 70 motorcycle are designed to offer enhanced durability, aesthetics, and functionality. Here’s a detailed description:

- **Material and Construction**: These fuel tanks are typically constructed from high-grade, corrosion-resistant steel or aluminum. The material is often thicker and more robust than standard tanks, providing extra durability and resistance to dents and impacts.

- **Advanced Coating**: The exterior of these tanks is treated with a special anti-corrosive coating, often using powder coating or high-quality enamel paint. This ensures the tank remains rust-free and maintains its luster for an extended period, even under harsh environmental conditions.

- **Increased Capacity**: Some special quality tanks may offer a slightly larger fuel capacity, ranging up to 10 liters, to cater to those who require longer riding ranges without the need for frequent refueling.

- **Enhanced Design and Aesthetics**: The design of these tanks often features sleek, modern lines with custom paint jobs, decals, and finishes that set them apart from standard tanks. Popular color choices may include metallic finishes, custom graphics, or even personalized designs.

- **Premium Fuel Cap**: The fuel cap on these tanks is usually a high-quality, chrome-plated or anodized component, featuring a secure locking mechanism and a tighter seal to prevent leakage and tampering.

- **Integrated Fuel Gauge**: Special quality tanks might include an integrated analog or digital fuel gauge, providing the rider with a clear indication of fuel levels at all times.

- **Ergonomics and Fit**: These tanks are designed to perfectly fit the CD 70 frame, ensuring an ergonomic riding posture and easy installation. They may also include additional padding or rubber linings at contact points to minimize vibration and noise.

- **Custom Accessories**: Some sets may come with additional accessories like matching side covers, emblems, or badges that enhance the overall look of the motorcycle.

This description covers the key aspects of special quality fuel tank sets for the CD 70, emphasizing their superior construction, design, and additional features that provide both functional and aesthetic benefits to the motorcycle.