Note that it is an aspect of the Sorby machine that the belt runs towards the blade causing excess wear and breakage, it's important to approach the belt with care and to skiff gently, don't press the tool into the belt.
A Range of belts made to fit the Robert Sorby Pro-edge machine and Axminster Trade Ultimate Edge Sharpening SystemZirconium belts (blue) are widely used in industry for metal grinding, they cut well and have a good lifespan, they are self sharpening so don't press too hard, Phoenix Naylors belts are manufactured in Chesterfield and are the good quality at a good price. Klingspor Zirconium belts are excellent quality at a good price.
Ceramic are tougher than Zirconium, should have a longer life and are available in higher grits.
