POWERFUL CUTTING PERFORMANCE Carefully designed blade structure, rake angle, flute depth and spiral angulation combined with our specially formulated tungsten carbide results in the powerful cutting performance of our burs. Prima classic burs are engineered to deliver the most efficient cutting rate & performance for the most popular procedures. MAXIMUM STRENGTH & DURABILITY Proper selection of tungsten carbide and high quality steel combined with a specialized heat treatment process and controlled welding operation creates the optimum conditions required to attain the impressive strength and durability of a Prima classic bur. CONSISTENT QUALITY Prima classic is ISO 13485 , EN46001 and CE Mark Certified which means a Prima classic bur is manufactured to the highest quality standards.You can depend on the consistent quality of a Prima classic bur... in all ways, always.