Artifex Abrasive Wheels is a polyurethane bond with silicon carbide grain. Ideal for de-burring and light grinding of metals; HP=Hard Compound 3200 RPM, MP=Medium Compound 2550 RPM. Artifex wheels come in 100mm and 150mm. Artifex Wheels come in a range of size, grit and grade of bonding. Elastic Bonded Wheels, Artifex are very popular for engineering and jewellery industry for finishing.