The main difference between Ludicrous and Ludicrous +PLUS series is the material we use for manufacturing the props. While the original Ludicrous propellers use our traditional engineered glass fiber polyamide for strength and rigidity, the Ludicrous +PLUS propellers are produced from a high impact resistant engineered polycarbonate resulting in more flex, almost unbreakable blades with an unique transparent cool look. The blades are completely interchangeable with the original Ludicrous series and share all the performance advantages in terms of speed and efficiency.