✦ Natural pumice stone for removing stubborn calluses ✦ Convenient mini file for spas and overnight stays How about this set!? ① Natural pumice stone with string: Comes in vinyl packaging ● Size: Approximately 9 x 6 x 2.0 cm ● Material: Volcanic rock * Pumice stones are breathable and have good drainage, so the string allows for more hygienic storage. * Natural pumice stones have small holes. Water and volatile components like carbon dioxide are dissolved in magma, and these expand and cool during eruptions, forming many small holes. (Small holes are not defects) ② Filing surface: Oval (one side only) ● Size: Approximately 17 x 3.3 cm ● Color: Black