Madeira Rayon 40 Bright White Embroidery Thread 1100YD. Madeira Rayon No. 40 in one super spool. Spool size allows multiple runs of the same design without changing the spool. 1100 yds/1000 m is nearly 2/3rds of a mile. 100 Percent Rayon. For Machine Embroidery. CHK-98411001