... M,22M/M etc. nice and durableSilk satin, 19M/M, 16M/M, classic and popularSilk Habotai sand washed, machine washable, 12 M/M, 14.5 M/M ... , 18.5 M/M soft and nice.Silk charmeuse, best hand felling, 19 M/M, 16 M/MSilk/cotton satin ... 55%, cotton for 45%,19 M/M.PS: measuremnt of weight of silk: momme (M/M)One momme equals to 4.3056 ... pure muberry silk hand made long floss Grade A