5 In 1 Replacement Pro Blade, Fits Arco, New Tooth Geometry For Improved Cutting & Feeding Performance, Stronger Adjustable Tab For Less Breakage & Optimal Blade Usage, New Dirt Shield That Covers The Back Of The Blade Allowing For Easier Cleaning & Longer Life Of The Blade, Low Maintenance, No Sticky Foam To Deal With Adjusts From Size # 9, 10, 15, 30 & 40.