 All NTT IndyCar Series cars use carbon-fiber shell driver's seats with 6-point safety restraints.The cars' steering wheels are designed by Cosworth with a system of buttons that allow the drivers to make adjustments to their cars mid-race.All IndyCar Series cars were equipped with Pi Research Sigma Wheel to Display data display units from 2001–2017 until they were replaced by Cosworth's Configurable Display Unit 4.3 display from 2018 onwards.