EDCO foil is made with dead soft copper that conforms easily to the shape of the stained glass. EDCO brand is known for its superior adhesion and resistance to all of the chemicals used in stained glass. This foil is coated with a silver backing, 1.25 mil thickness and is available in 3/16", 7/32" & 1/4" widths. Proudly made in the USA. Sold in a 36 yard roll.