Andis 04604 Outliner II Trimmer Replacement Blade – Made of Stainless and Carbon Steel, Close-Cutting Square Blade, Deep Tooth Blade for Crisp Outlines & Designs - for GO & GTO Trimmers, SilverSQUARE BLADE: The blade has a square form to it. The blade is made up of stainless carbon steel with zero gaps between the tooth of the blades. RUST RESISTANT: A cooler and more comfortable smooth cutting experience is offered by the heat and rust resistant close cutting square blade. DEEP TOOTH: Longer hair can pass through the blades more quickly because of the high teeth and space between them, making them effective for light fading. CLOSE CUTTING: