40 colors embroidery thread kit. Using a color chart to find similar Brother color No. and name the Conversion chart of Madeira is also available. Each Spool has 40wt and 500m (550yd) length ideal for all home-based embroidery machines. Holds up colors well even when subjected to commercial laundering bleaching and other harsh chemicals. High-quality plastic storage box is sturdy and compact and rarely get broken during transportation.