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 Horolovar mainsprings are made of the finest grade steel, tempered evenly throughout the entire length. They are designed to provide the right amount of power for your 400 day clock. Each mainspring is coiled to a diameter small enough to slide into the barrel easily. No expensive mainspring winder needed! Horolovar mainsprings are sized by the width of the spring and the inside diameter of the barrel in millimeters.