Edco copper tape for stained glass is a classic. I've used various types, but this is still the easiest to use, number one! Even when blackening the solder, the copper-colored backing of regular copper tape doesn't detract from the beauty of the glass, so this color is recommended for all but transparent clear glass. Whether the colored glass is transparent or opaque, the blackness won't bleed from the edges, and the sparkle won't be lost, so please use the copper-colored backing. The width is 5.6mm, which is perfect for 2mm to 4mm glass, and it's a very easy-to-use regular type. I bought extra when purchasing for my own projects. ● This is not tape that has been stored for a long time and has lost its adhesiveness; it's newly arrived. ※ Discounts are not available except for bulk purchases.