Streamlined extensions are made of ultra-strong, 32mm, T8 aluminum that is red anodized on the inside and outside. The tubing is engineered so that with its large diameter, the wall thickness can be thinner so the overall result is an incredible high strength, to low weight ratio. This formula has been proven with our years of experience. The holes are precision punched with permanent laser numbered 2 centimeter settings. The adjustment settings are held with a hard anodized aluminum collar tethered with a spectra line to a stainless steel pin. Fail-safe and virtually break proof.These extensions are strong, durable and light weight. The super powerful 6:1 downhaul cleat has large diameter pulleys, and is perpendicular for power, easy rigging and no crossed lines. A tough Dyneema “super downhaul” line is included.