19MM 4PCS Silk Sheet Set contains: 1pc 19mm Silk Fitted Sheet 1pc 19mm Silk Flat Sheet 2pc19 Momme Terse Silk Pillowcase. 100% 19 Momme pure long stranded Mulberry silk Soft smooth and light it gives the least pressure on your body. Consisting of natural proteins that are very similar to ones in human hair silk helps reduce any potential allergic reactions. The sericin in silk dispels accumulation of melanin in your skin preventing/delaying any black spots from forming on your skin.