The jml ped egg power is the fastest safest way to remove tough calluses and dry skin from your feetjust switch on the cordless device and let the abrasion roller work away at the dead skin as it spins up to 2000 rpm then use the smoothing roller for gentler softer buffing that leaves your feet smooth and baby softsize 16cm x 65cm requires 2 x aa batteries not included set includes 1 x abrasion roller and 1 x smoothing roller