ITEM NAME:10pcs Shark Fin Diffuser Vortex Generator for Windscreen RoofSpoiler Bumper Product Description Description: Features: Suitable for most cars, trucks, and off-road vehicle; It is installed on vehicle roof spoiler, windscreen, bumper, etc. Professional installation is recommended. Specifications: Size: 8 x 4 x 2.2cm/3.15 x 1.57 x 0.87" Weight: 5g Material: ABS Applicable models: universal Inclus: 10 x Shark Fin Diffuser Vortex Generators 10 x Adhesives.Inclus: 10 x Shark Fin Diffuser Vortex Generators. It is installed on vehicle roof spoiler, windscreen, bumper, etc. If item is defective after 3 months, you can still send it back to us. We will send you a new one after receiving the defective item.