Hit the concrete and get going on Spitfire's Kader Radial Full Formula Four 57mm 99a skateboard wheels. The wheels' round-edged design and sturdy 99a durometer work together to provide power to your slides and keep your setup under control, while the large 57mm sizing lets you easily pick up speed. Spitfire's signature Bighead logo decorates the sidewalls, adding a splash of sinister branding to the mix.