Breakthrough strength-to-diameter co-polymer is 33% stronger than the average mono. Unprecedented 15% stretch for incredible sensitivity and hook setting power. New Filler Package! New Smaller, Clear Spool! Less Weight! Less Waste!. Thin diameter allows exceptional bait action and high line capacity. Excellent knot and shock strength - even when wet. Optimized for baitcast reels, but still castable and manageable on spinning reels.