The new "HMX" pre-preg carbon graphite extensions are light, feather-lite. They have an incredible strengt-to-weight ratio featuring top quality pre-preg carbon fiber material. The 2 centimeter adjustment settings are set with a hard anodized aluminum collar tethered with a spectra line to a stainless steel pin. It comes with a beefy "Power-Six" super powerful 6:1 downhaul cleat with large diameter pulleys perpendicular for power, easy rigging and no crossed lines and a tough Dyneema "super downhaul" line.