FR4 Copper Clad Laminate Board | Special For PCB Supply single and double sided copper clad sheet with various thickness. Quality Assurance · Eco-Friendly Material · Technology Support · Shows: 1.6MM CCL sheet, 35um/35um CCL sheet. www.fr-4material.com/ FR4 Copper Clad Laminate Board | Special For PCB Supply single and double sided copper clad sheet with various thickness. www.fr-4material.com/ |