High-quality replacement 40mm Dust Boot designed for StopTech performance braking systems. This component ensures the hydraulic system remains free from contaminants, debris, and moisture, maintaining optimal piston movement and caliper longevity. This product is sold as a single unit. Components included: - StopTech 40mm Silicone Dust Boot (PN: 750.99005) x 1pc Compatible with the following StopTech Caliper Series: - ST-22 - ST-40 - ST-43 - ST-45 - ST-60 - ST-65 Engineered for high-heat resistance and durability under track and street performance conditions.