The Gravel wheel is also available in a matte black with machined ring finish. This wheel is a must-have for a true offroader as it looks as good as it performs. Made from one-piece cast aluminum for a no-compromise strength and durability. The Gravel wheel boasts a five split-spoke design accented by a rally ring for additional rigidity. Black Rhino Gravel wheel is available in 15x7 size only.