Class C galvanized steel strand, 1x19, 8mm to 16mm, with an extra heavy zinc coating for guy lines that live in salt air. Coating class is the cheapest insurance on a galvanized strand and the first thing a cost driven buyer removes. Class A coating gives roughly 215 to 260 grams of zinc per square metre and is fine inland. In a coastal yard that same strand will show red rust at the low points within a few years, long before the steel has lost any meaningful strength. Class