Usage Tips:Extra Coarse - Set of 9 Scholl Pedi Extra Coarse Replacement Rollers to meet your callus removal needs. Extra coarse to effectively remove even the toughest calluses Safe and effective - These Scholl Velvet Smooth replacement rollers have a curved design and fit your feet perfectly. Long-lasting diamond crystals, micro-abrasive particles, removes hard, rough, cracked, dry and calloused skin, gives beautiful, soft feet effortlessly Save time and money - Do you regret that your Scholl replacement rollers are more expensive than Other? - Now you can get a pack of 9 Scholl Velvet Smooth refills at a really reasonable price and much cheaper than the Application - These replacement rollers are perfect for Scholl Velvet Smooth pedicure and other brands of foot care callus removers< /p > Easy to install - Easy to install with just one click, replace the Scholl Velvet Smooth roller when it becomes less effective, suitable for soft, hard, dry and sensitive feet