The finest, strongest thread for micro stipple quilting, detailed embroidery and small lettering, long arm quilting, sergers, french hand sewing, cross stitch, colored bobbin thread, nearly invisible hand-turned applique and perfect for quilt piecing. Looks and feels like silk but stronger and less expensive. 60wt. polyester, similar to Sulky Blendables only very fine, colors change in predictable 1 segments. 440yd per spool, 3 spools per box.