High-quality replacement 36mm piston seal manufactured by StopTech. Specifically designed for high-performance braking systems and multi-piston calipers to ensure leak-free operation and optimal piston retraction. This is a single component kit. Part number includes: 1 x 36mm Inner Pressure Seal (Art. 753.99003S). Ideal for rebuilding StopTech ST-40, ST-60 calipers or compatible OEM Brembo units requiring 36mm seals.