Onyx Professional Double-Sided 100% Siliglass Pumice Stone for Feet Smooth away calluses and dry patches fast with Onyx Professional Glass Pumice Stone – The World’s Best Pumice Stone! Sourced from Spain and made of 100% siliglass, this 2-in-1 exfoliating stone’s wide pore structure resists bacterial, fungal and liquid absorption to prevent mildew and further bacteria growth. This foot scrubber has two coarseness levels to accommodate any skin type. The coarse green side works quickly and effectively...