Biela carbon fiber propellers are made exclusively from high-quality raw materials. Particularly precise shapes and expert manufacturing allow for very accurate balancing, resulting in an exceptional running culture of the engine. The front is white with red blade tips, and the back is black, as is often seen on original aircraft. Therefore, it is very true to scale! Semi-scale props have been specifically designed for certain aircraft models and give the model the finishing touch for a perfect appearance. The "Sport" series has been developed specifically for the needs of aerobatics and offers approximately 10% better efficiency while simultaneously reducing noise levels. 2-19X10-R-BY-BS.