The Scientific Anglers Absolute Flat Mono Shooting Line is a high-performance monofilament running line designed for Spey, Skagit, and Scandi fly fishing applications. Featuring a unique flat, rectangular profile, this premium shooting line reduces line twist, improves grip, and delivers smooth, low-memory performance for long, efficient casts. Unlike traditional round monofilament running lines, Scientific Anglers Absolute Flat Mono features a rectangular cross-section that provides better handling and control while maintaining excellent shooting performance. Its size-specific hardness is engineered to minimize coiling and memory in a wide range of fishing conditions, making it an excellent choice for both single-hand and two-handed Spey casting systems. Available in four breaking strengths from 25 lb to 50 lb, each with a highly visible color, Absolute Flat Mono allows anglers to match their running line to their shooting head grain weight and preferred fishing setup. Key Features Flat Rectangular Profile: Reduces line twist while providing improved grip and control compared to traditional round monofilament shooting lines. Excellent Shooting Performance: Designed for smooth line delivery and efficient distance casting with Spey, Skagit, and Scandi shooting heads. Low-Memory Design: Size-specific hardness helps minimize coiling and tangling in varying temperatures and fishing conditions. Improved Line Handling: The flat profile provides a secure grip when casting, stripping, and managing running line. High-Visibility Colors: Bright, size-specific colors make it easier to track your running line on the water and at longer distances. Four Breaking Strengths: Available in 25 lb, 35 lb, 42 lb, and 50 lb options to accommodate different shooting head weights. Versatile Spey Applications: Suitable for single-hand Spey, two-handed Spey, Skagit, and Scandi fishing systems. Durable Nylon Monofilament: Engineered for consistent performance and reliable handling. Specifications Breaking Strength Color Recommended Head Grain Window Diameter 25 lb Yellow 150-330 grains .017" / 0.43 mm 35 lb Orange 270-420 grains .019" / 0.48 mm 42 lb Chartreuse 390-510 grains .022" / 0.56 mm 50 lb Optic Green 480+ grains .025" / 0.64 mm Material: Nylon Monofilament Profile: Flat / Rectangular Line Type: Monofilament Shooting Line / Running Line Primary Applications: Spey, Skagit, and Scandi Fly Fishing Why Choose Scientific Anglers Absolute Flat Mono? A quality running line can make a significant difference in casting distance, line management, and overall fishing performance. Scientific Anglers Absolute Flat Mono combines the shooting efficiency of monofilament with improved handling characteristics that are particularly valuable when fishing shooting head systems. Its rectangular design helps reduce twisting and provides a more comfortable, secure grip, while carefully controlled hardness minimizes line memory. The result is a running line that shoots efficiently, handles predictably, and performs across a variety of fishing conditions. Whether you&';re swinging flies for steelhead, targeting salmon with a two-handed Spey rod, or assembling a lightweight single-hand Skagit system, Scientific Anglers Absolute Flat Mono offers a versatile, performance-driven solution for your shooting line setup.