The Micro-Pedi 4 Men Golden Blue Rollers are specially designed for unisex tough calluses. * Great for women"s rough calluses * Glide the roller over the callus/hard skin area for 2-3 seconds. Do not press hard. Check results and continue to use for 2-3 seconds until the desired level of smoothness is obtained. * Safer and more effective than metal scrapers and easier than a pumice stone * Emjoi® Micro-Pedi 4 Men Golden Blue rollers fit only Emjoi Micro-Pedi units.