It works! No ripped calluses.
It works!  I have not experienced a ripped callus since using this product and am able to perform large sets of pull ups and or toes to bar in consecutive days without any trouble from hand blisters or calluses.  I use it after showering following a workout while hands are softened.  Simply use the course side to file down the callus, then the fine grit side to smooth them out, finally, apply your favorite hand balm or lotion.  It's easy to clean - (remove the metal piece and rinse underneath the coarse side after each use plus, then rinse the fine grit side, air dry).  Has held up to near daily use after 6 months and still looks and works as if it were brand new.
Rating: 5 stars