Fantastic quality For ONE 57mm x 19mm ZIRCONIA CERAMIC Slotted Slitter Blades Blades are .4mm thick, also known as “slotted slitters” Double edged Used in film, foil, paper slitting, and other precision applications. Ceramic slitter blades are designed for high performance industrial applications. Also available in the slotted style to meet your slitting and converting needs. The durability and performance of Zirconia ceramic is unmatched, they will last 20-30 times longer than other types of blades and are extremely hard, sharp and wear resistant. Please note this is for one ceramic blade