Steel clips are definitely better than aluminum for a flip placard system. Compared to aluminum, stainless steel clips have a higher strength-to-weight advantage, which means they maintain their strength and have greater load-bearing capabilities while having a thin profile. After a point of time, lighter clips like those made of aluminum lose their snapping power. Also, stainless steel hardware is generally resistant to rusting, corrosion, or pitting, making the placards ideal for rainy and wet locations. Double-riveted stainless steel spring clips are tougher and lock the flip placards into place. Clips are simple to operate and lock down hard. With a strong locking system, your legends stay put and withstand the toughest conditions truckers face like wind, speed, storms, and constant opening and shutting.