The Zoom Xtech HB100 Hydraulic Disc Brake Calipers are designed for MTB bicycles. These brake calipers are available in black, red, blue, purple, and gold colors. The front caliper weighs approximately 199.6g (excluding discs), while the rear brake caliper weighs approximately 204.8g (excluding discs). These hydraulic disc brake calipers feature the new hydraulic line clamp technology. The cylinder of the caliper contains built-in brake fluid, which is controlled by the brake inner cable. This bidirectional braking system ensures reliable and efficient braking performance. Please note that after removing the barrier sheet, the caliper should be installed in front of the bike to ensure proper braking. If installed incorrectly, the brake pads may mix together and new oil will be required. The package includes 1 disc brake caliper. Key Features: Designed for MTB bicycles Available in black, red, blue, purple, and gold colors Front caliper weighs approximately 199.6g (excluding discs) Rear brake caliper weighs approximately 204.8g (excluding discs) Features new hydraulic line clamp technology Bidirectional hydraulic piston braking Easy installation Package includes 1 disc brake caliper