Small teeth with a more concentrated pattern for an efficient cut in dry environments or for harder hooved horses. 
The Black Master receives a special surface treatment at our Heller factory that prolongs the life of the rasp.
Rasp side:
Smaller tooth design
More concentrated tooth pattern, ideal for hard and dry hooves
Developed for dry weather conditions
File side: 
File pattern creates efficient removal of hoof with little effort leaving a smooth surface