Dimension: 4-1/2in X 3-1/8inX 1in. 50 fins required for per RV. KUAFU started back in 2012 and dedicated to provide reliable and innovative products to enhance the performance and functionality of your vehicle. 80 fins required for per truck or trailer. Car Generator KUAFU Universal Fairing Fins Kit Stick-on Vortex Generator Air Foils For Trucks, Trailer, RV Spoiler Wing White PP Plastic 80 PCS Roof Rack Wind Deflector Installation: First, choose the installation location as close to the rear edge of the vehicle as possible. Aazon.co: KUAFU Universal Fairing Fins Kit Stick-on Vortex Generator... Elevate your driving experience with KUAFU. 90 fins required for per truck or trailer with lower skirting. Compatible with Most Trucks: The fairing fins are designed to be compatible with a wide range of truck, trailer and RV. 8pcs Carbon Fiber Look Universal Vortex Generators Roof Shark Fins Spoiler Wing Kit Black For Car Package include Mounting Hardware, NO instruction. Buy CHIFUN Engine Guard Front Rear Highway Crash Bars Steel Replacement for Honda Goldwing 1800 GL1800 2001-2017 GL1800A 2001-2006 Black Motorcycle Frame Protection Bars High-quality, weather-resistant PP plastic, the fairing fins are built to withstand the rigors of long-haul trucking. KUAFU Universal Fairing Fins Kit Stick-on Vortex Generator Air Foils - 80Pcs The fairing fins are designed to improve airflow around the truck, reducing drag and ultimately improving fuel efficiency.