Core Sensor 4 / 4S Pro Tectanium 2 Back Line Set 18+4+2 – Core Kiteboarding The Core Sensor 4 / 4S Pro Tectanium 2 Back Line Set is a high-performance replacement back line system designed for precision steering, durability, and consistent kite response. Made from advanced Tectanium® material, these lines are extremely strong, low-stretch, and shrink-resistant, ensuring reliable handling session after session. This modular setup (18m + 4m + 2m) allows you to easily replace or adjust individual sections of your back lines without needing to change the entire set. It is built for riders who demand direct control and long-lasting performance in all conditions. Features: Compatible with Core Sensor 4 and 4S Pro bar systems Modular back line set (18m + 4m + 2m) Made from high-performance Tectanium 2® material Low-stretch and highly durable construction Shrink-resistant for consistent performance over time Ensures precise and direct steering response