FR4 Copper Clad Laminate Offcuts are leftover or trimmed sections of high-quality FR4 CCL sheets, made from woven fiberglass fabric and epoxy resin with a copper foil layer. Despite being offcuts, they retain the same thermal resistance, electrical insulation, and mechanical strength as full-size sheets, making them ideal for prototyping, DIY electronics, repair work, and low-volume PCB manufacturing.ent.