[Specifications] An indispensable safety component for ziplines. The 5.4-foot spring brake helps reduce impact force at the end of the line, suitable for applications such as steel cable runs and cargo lifting. Offers excellent stretching and rebound performance. Rubber head size: 7 x 4 x 4 cm. [Extension Spring] Features a 5.4-foot spring, longer than most comparable models, providing an extended effective deceleration distance for smoother and more reliable stopping performance. [Flexible and Durable] Constructed from stainless steel for high tensile strength, durability, and rust resistance. Multiple forging processes and strict quality control ensure long service life. [Silica Gel Buffer Plug] Star-shaped soft silica gel plug enhances flexibility and helps protect components from damage or breakage. Advanced manufacturing ensures consistent performance. Each spring features uniform pitch, clear texture, and precise craftsmanship for stable resilience. [Easy to Install] No tools required. Simply thread the cable through the green star-shaped silicone plugs on both ends. Color: as shown. Material: Stainless steel + rubber. Size: total length 165 cm, spring outer diameter 2.5 cm. Package includes: 1 x spring, 2 x silicone head. Package content limited to items listed; other items not included. Note: Lighting and display differences may cause slight color variations between image and actual item. Measurement allowance: +/- 1-3 cm.