This 4mm ribbon is 100% silk and it does not fray. Each color also comes in 7mm and 13mm widths. Great to use for adding dimension to any needlepoint piece. If you have never used ribbon before, I would encourage you to look at the books in the accessory category. They are very user friendly. If you call or email me I would be happy to suggest which book would be best for your piece. As with any overdyed fiber, make sure that you have enough fiber at the start of your project to complete your piece. Dye lots can very widely.