Cobalt Blue Fold Over Elastic 100yd. When you buy in bulk, you save! Our 100 yard wholesale rolls are neatly packaged on a nice spool for your convenience! Our high-quality Fold Over Elastic is 5/8” wide. Fold over elastic is flat and measures 5/8" wide, and features a line down the center. It can be used for headbands, decorations and a bunch of other fun sewing projects. the bold and bright blue of this elastic resembles the color of the chemical elements Cobalt .