DetailsWahl's Stainless Steel 4 Comb (1/4") glides through the coat quickly and efficiently for a smooth finish. This universal self-adjusting snap-on comb features a 4-sided security fit. The 4 comb has a Purple color-coding for easy reference and smooth tips for snag-free grooming. Works best with the Wahl Competition Series #10, #15 or #30 Blades, but will work with other brands as well. Never use a #40 Blade!!!