City of Toledo has 2000 years old tradition in sword making. Marto swords company keeps follows this old tradition till today. The fame of Toledo steel was enrooted in the mastery with which some artificers handled tempering, without any techni- cal knowledge, or instrument capable of measuring, by far, the high temperatures for such magical treatment and transformation. This ability and mastery “The secret of the temper” have been protected by all sword masters of Toledo, being transmitted only generation to generation till today, proving that Toledo steel is unique in the world.