50 wt. 3-ply Egyptian-grown extra-long staple cotton thread. Designed for piecing, quilting, and sewing. MasterPiece is known to be one of natureâs finest threads. It is certified Egyptian-grown, extra-long staple cotton and designed to create perfectly pieced seams. With the finest spinning, twisting, dyeing, and finishing techniques, MasterPiece has extremely low lint. You and your machine will love the sewing experience.