If you're looking for a quality flexible mudguard set for CD 70 bikes, you want to consider a few factors:

Material: Look for mudguards made from durable and flexible materials like polypropylene or ABS plastic. These materials are impact-resistant, lightweight, and can withstand rough riding conditions.

Fit: Make sure the mudguard set is specifically designed for CD 70 models to ensure a perfect fit. Check if the set includes both front and rear guards.

Flexibility: Since you are prioritizing flexibility, choose mudguards that are easy to install and remove. This will also help in off-road conditions, where they can bend without cracking.

Finish: Consider mudguards that are either matte or glossy, depending on your style preferences. A UV-resistant coating can also prevent color fading.