Boat steering wheel is made of stainless steel and black foam wheel. The knob make your control more stable, labor-saving and safer. Anti-skid slot design, good hand feeling, which is comfortable to grip. Dimensions: 13.5" Dia.,25 Degree Dish,5 Spoke. Easy to install, high performance and it is in great reliability. Perfect for a new boat or yacht or a new change of steering wheel. Awesome quality and construction add enough weight and momentum to make easier steering. Specification: Diameter: 34.3cm/13.5inch Dish: 25 Degree Material: Stainless Steel Color: Black Package Includes: 1 Piece Marine Steering Wheel Note: Conversion: 1inch=2.54cm, 1cm=0.393inch Please allow slightly 0-1cm difference due to manual measurement. Colors can appear different depending on light and how the listing is viewed. Thanks for your understanding and attention. Wish you a pleasant shopping experience