20 Sheets Press-n-Peel Blue PCB Transfer Film, Printable A4 SizeNote: May not work well with later model Brother brand copiers and laser printers. 20 sheets of Printed Circuit Board transfer film for high precision, professional layouts. Adds extra layer of resist for super fine lines (less than 5 mil) and solid ground planes on single and double sided copper clad. Works with plain paper copiers and laser printers (Note: Not for use with inkjet printers). Eliminates darkrooms, chemicals, negatives and copy