Usage Tips:Extra Coarse - Set of 9 scholl pedi extra coarse rollers to meet your hard skin removal needs. Extra coarse to effectively remove even the toughest hard skin Safely and effectively - These smooth scholl velor rollers feature a curved design and fit your feet perfectly. Long-lasting diamond crystals, micro-abrasive particles, remove hard, rough, cracked, dry and calloused skin, provide beautiful soft feet effortlessly Save time and money - do you regret that your Scholl rollers are more expensive than the others - Now you can get a 9 pack of scholl velvet smooth refills at a really reasonable price and much cheaper than the Application - These roller heads are perfect for scholl velvet smooth pedicure and other brands of callus remover for foot care Easy to install - Easy to install with just one click, the Scholl smooth velor roller when it becomes less effective, suitable for soft, hard, dry and sensitive feet