Slip Pure Silk Pillowcase - BlackNot all silk pillowcases are created equal Includes 1 x pillowcase Machine washable Slipsilk is specially commissioned and made to our exacting standards, developed and refined over ten years to provide the ultimate combination of shine, thickness, softness and durability. We use the highest grade (6A) long fibre mulberry silk, with a thickness of 22 momme and enforce the strictest quality guidelines, including non toxic dyes.