1/4" Wide Copper foil tape has an acrylic adhesive backing designed to withstand the heat of soldering.  The copper foil tape is used as the base for your soldering.  The width is perfect for wrapping 2 pieces of our 1mm thick glass with art sandwiched between. When centered perfectly on the tape this will give a nice border but not much room to trim away excess tape.  Lisa uses this for smaller pieces of glass especially the rounded shapes.  15 feet will go a long way for small projects!