Simpson Racing SD1 Helmet - XXL - CopperXXL - Copper - SA2020 Legend Torque Ball - Housing /

Torque Ball - Housing / Retaining Collar / Rubber Boot Included - Aluminum / Steel - Winters Torque Ball Assembly - Kit

000 in ID Bearing - Double Bearing - Axle Clamps - Steel - Black Powder Coat - Each

Pressure Gauge - Pro-Comp - 0-300 psi - Mechanical - Analog - 2-5/8 in Diameter - Liquid Filled - 1/8 in NPT Port - Black Face - Each

Tachometer - QuickTach - 15000 RPM - Digital - 3 in Wide x 3 in Tall - Recall - 9V Battery - Waterproof - Aluminum - Black - Each

Battery - Lithium-ion - 12V - 925 Cranking amps - Top Post Terminals - 7

Simpson Racing SD1 Helmet - XXL - CopperXXL - Copper - SA2020 Legend Torque Ball - Housing /Simpson's, lightest and most aerodynamic helmet, the SD1 is a premium helmet at a reasonable price. The helmet is tailored towards open wheel dirt track racing with no front vents and a front chin spoiler.