The 1Set OPC Drum Unit Kit is a replacement part designed specifically for Canon iR ADVANCE 4525i, 4535i, 4545i, and 4551i copiers. This kit includes a Primary Charge Roller and an OPC Drum, essential components for maintaining the functionality of these copier models. Made by Canon, a trusted brand in office equipment, this kit is manufactured in China and contains a total of 3 pieces. Ideal for businesses and industrial settings, this drum unit rebuild kit ensures high-quality performance and longevity for your Canon copier.