Silk Ribbon is 100% Silk and available in six widths (2mm or 1/10", 4mm or 1/8", 7mm or 1/4", 13mm or 1/2", 18mm or 3/4" and 32mm or 1-1/4") as well as 184 different colors. Not every size comes in all the colors. The only width that is available in all 184 colors, is the 4mm size. And there are very few colors that are 18mm wide. Every color and every width available is regular stock.