[Specifications] An indispensable partner for safety ziplines. The 5.4-foot spring brake helps reduce impact force on the rope, suitable for applications such as steel cable rigging and cargo lifting. Offers excellent performance in stretching and rebounding. Rubber head size: 7 x 4 x 4 cm. [Extension Spring] This zipline spring brake features a 5.4-foot spring, longer than most similar products on the market. Provides a longer effective deceleration distance for improved and smoother deceleration performance. [Flexible and Durable] Constructed from stainless steel, offering superior tensile strength compared to standard stainless steel of the same size. Resistant to rust and built to last. Multiple forging processes and strict quality control ensure a longer service life. [Silica Gel Buffer Plug] Features a star-shaped soft plug made of silica gel that is flexible, non-damaging to other components, and resistant to breakage. Uniform spring pitch, clear texture, and fine craftsmanship ensure consistent resilience. [Easy to Install] No tools required. Simply thread the cable through the green star-shaped silicone plugs at both ends. Color: As shown Material: Stainless steel + rubber Size: Total length 165 cm, spring outer diameter 2.5 cm Package Contents: 1 x Spring 2 x Silicone Head Note: Light and display differences may cause slight color variations between the image and the actual item. Measurement allowance: +/- 13 cm.