Madeira Aerofil no.35 Extra Strong is as its name suggests – super strong and heavy duty! Designed as a high-quality sewing thread for multipurpose use, this thread will satisfy the needs of even the most high-strain enduring seams, to button holes and everything in between. Suitable for use with heavy fabrics such as denim or leather. Made from 100% polyester, washable up to 95 degrees and suitable for tumble-drying at lower temperatures. 100 metres of thread per spool. This assortment contains 8 spools of standard colours.