Reinforce Your Stained Glass Project Like a Pro Re-Strip is a rigid ribbon like strip of 10 mil thick copper that is used between glass pieces as hidden structural reinforcement. To use, insert into lead came channel or solder between foiled panels. Recommended for windows, on lampshade edges, or in any fragile construction. Measures 5/32" wide by 10 mil thick by 100 ft. long. Image shows 25 ft roll.