Berkley ProSpec Chrome Monofilament - Berkley ProSpec Chrome Monofilament fishing line is the result of nearly three years of product and field testing with professional Captains and Guides. This high-tensile strength, co-polymer monofilament is specifically engineered to be highly abrasion resistant -- for all situations which demand added durability. Professional grade Abrasion resistant Premium saltwater monofilament High tensile strength - ties powerful knots Outstanding linear strength Designed and tested by top captains