Replacement seal for HOPE caliper, part number HBSP207. This seal is compatible with the HOPE Trial Zone caliper. The seal is designed for DOT 4 or DOT 5.1 brake fluid and 25mm HOPE pistons. If you're looking to reseal your brake caliper's HOPE caliper, this is exactly what you need. For one HOPE Trial Zone caliper, 2pcs of seals are required.