I just haven’t used this so I’m selling it. I use something different. This smoothing stone can be used for a pedicure or other things. It has two sides; the green side is coarse and the white side is fine. Rub away calluses and hard dry skin. Use the green side for your feet and follow up with the white side to smooth out. Or just use the white side on delicate areas like elbows. If you use this item wet it is a lot more comfortable. It is safe, effective, hypoallergenic and pH neutral it’s eco-friendly, as well. Measurements are estimated