This sewing thread is made from 100% gassed and mercerized extra-long staple cotton, which is stronger than standard cotton. The special gassing and mercerizing production process creates thread with minimal lint, a smooth surface, subtle, elegant luster. Each spool holds 600 meters of thread, a single ply rated 50 weight, the three-ply twisted bonded thread has an actual weight equivalent to 30WT. It works for a wide range of uses including quilting, serging, piecing, machine sewing, hand sewing, heavy machine embroidery, light hand embroidery. This mercerized cotton thread is ideal for natural fabrics like cotton and linen, as its washing shrinkage rate closely matches that of these materials, preventing puckering after washing caused by mismatched shrinkage between fabric and thread. Available colors: 12 Bright Colors, 12 NeutralandJean Colors, 16 Pastel Colors, 16 Variegated Colors, 24 Basic Colors, 5 White+5 Black Colors