The T-Outliner Replacement Blade is made of carbon-steel for a dependable, long-life blade that stays sharp. This close-cutting T-blade is an replacement blades for "GTO, GTX, and GO" Andis trimmers. Size: Leaves Hair Inch: 1/150 . Leaves Hair mm: 0.1 mm. Item Weight: 0.8 oz. Ensure the longevity of your blade's life by oiling it before every use.