Stretch loops are made from a 1/16" round stretch tie cord which is elastic with a metalized polypropylene coating. The 6" & 8" loops fit most jewelry boxes and give them that final touch. The 10" is great for smaller apparel, stationery & gift boxes. The 16" and 19" loops fit larger boxes such as our apparel boxes. Just wrap it around your package and you're finished! Lengths are approximate circumferences. To determine which size stretch loop you need, wrap a string or narrow ribbon around the item in the path you want the loop to take. Then measure the string on a flat ruler to find the total inches of the path. Select a loop 2 to 3 inches smaller.