The Rennform is a precisely crafted 15-spoke wheel constructed with Forming Technology to ensure a lighter and stronger wheel and comes in a Matte Grey finish. Flow Forming Technology involves the application of pressure to the inner barrel of the wheel, while spinning & after it has been casted. This process shares similarities to that found in the forging process in which the aluminum molecules are compressed resulting in a lighter and stronger wheel with greater shock resistance and elongation properties. Features: Available in the following sizes: 17"×8" 18"×8" 18"×9" 19"×8.5" 19"×9.5" Constructed using Flow Forming Technology Lightweight and stronger wheel with great shock resistance Available in Matte Grey What's Included: Konig Rennform Wheels