Polyester Embroidery Machine Thread Set (63 Spools, 500m Each) by SMB Always 63 Spools of 100% Polyester Embroidery Machine Thread 40 Weight, 500 meters (about 550 yards) per spool Beautiful, vibrant colors This thread set has the same color numbers as Brother thread for easy thread matching This is the exact same as the SMB Always 40 spool set, except with 23 additional colors.