This is copper foil tape for stained glass made by Edco. Width: 1/4 inch (approx. 6.4mm) Length: 36 yards (approx. 32.9 m) Adhesive color: Black Application: Used for wrapping glass pieces in stained glass and soldering #stainedglassmaterials #coppertape #copperfoiltape #copperfoil Thank you for looking.