Our 19MM 3PCS Silk Sheet Set is made from 100% Grade 6A mulberry silk Mulberry silk as its seamed counterpart with the difference being that unlike the seamed version which was made by combining two or more smaller sheets the seamless sheets are cut from a larger sheet not some combination of smaller sheets. Our silk is made completely from natural and pure silk produced by the Bombyx Mori silkworms the undisputed best quality silk in the entire world.