5 Pack, Bimetal, Utility Blades, Patented Bimetal Technology Blade Is Shatter Resistant, Stays Sharp 3 Times Longer Than Carbon Blades.
Blue Blades, 50 Pack, Bimetal Utility Blades, Patented Bi-Metal Technology Makes Blades Shatter Resistant & Keeps Blade Sharp 3 Times Longer, Also Includes A Dispenser That Easily Dispenses 1 Or Multiple Blades.