This set of two ZoeRuth premium quality Coarse Refill Rollers are compatible with the ZoeRuth Silver Rechargeable Callus Remover Foot File Model: ZR-CR200. Designed with high quality micro abrasive mineral particles to quickly and easily work to remove tough calluses and lifeless skin on your feet and heels. Used with the powerful ZoeRuth Callus Remover, the roller heads work effortlessly to exfoliate the foot through a gentle and safe rotating action, buffing away hard and cracked skin in minutes leaving you with feet that are simply beautiful and are silky smooth to the touch. EASY-TO-REPLACE ROLLER HEAD Replace the Micro-Abrasive Surface rollers when they are no longer performing to the standard you require. This will vary with frequency & duration of use. 1) To replace the roller head, ensure the unit is turned off. 2) Remove the roller by pressing the release button on the side of the unit and gently pulling the roller up. 3) Place the new roller in by putting one end in first then pushing down the other side firmly to click securely into place. SIMPLE OPERATION • Gently rotate the device back & forth or side to side over the callus, corn or hard skin area for 2 to 3 seconds. Stop, check then continue until the level of smoothness in achieved & your feet feel soft & silky smooth. •Stop if the skin becomes sore or inflamed. •Easy to clean under running water. •No need for any costly batteries. ZoeRuth is a family run independent manufacturer of these quality replacement rollers along with the original ZoeRuth Callus Remover ZR-CR200. With the use of quality materials in our devices we guarantee that you will not be disappointed. We pride ourselves in outstanding customer service and are always here to answer your questions.