Berkley ProSpec Chrome Monofilament - Berkley ProSpec Chrome 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 Excellent abrasion resistance High Tensile Strength - Ties powerful knots, outstanding linear strength Designed and tested by top captains