Brown Color, Fire Fighter - Flame Resistant, Machine Embroidery Thread, (#40 Weight, Ref. N1859), 1000 yd Spool by MADEIRA Options:# 40 --- 1000 yards Spool This will be the spacing

This will be the spacing measurement

On the wrong side

- This makes them an ideal choice for use in sewing

* Color: Light Beige

Brown Color, Fire Fighter - Flame Resistant, Machine Embroidery Thread, (#40 Weight, Ref. N1859), 1000 yd Spool by MADEIRA Options:# 40 --- 1000 yards Spool This will be the spacingFire Fighter is a fire resistant embroidery thread that was developed for fire and safety. Applications include aeronautics, utility services, motorsports and other fields where safety standards are required. Fire Fighter flame resistant machine embroidery thread is made from 100% Aramid which contains Nomex branded fibers from Dupont. Madeiras Fire Fighter embroidery thread complies with ISO standards ISO 6941, ISO 15025 and DIN EN ISO 11612 D + E.