Light Gray Color, Fire Fighter - Flame Resistant, Machine Embroidery Thread, (#40 Weight, Ref. N1610), 1000 yd Spool by MADEIRA DIY Creativity Kits The bottom hole director is

The bottom hole director is used for larger fibers or skeins

and quilters may experience shrinkage of 3-5%

fine or intricate detailing

fusing medium applied to both sides of the batting

Dries crystal clear

Light Gray Color, Fire Fighter - Flame Resistant, Machine Embroidery Thread, (#40 Weight, Ref. N1610), 1000 yd Spool by MADEIRA DIY Creativity Kits The bottom hole director isFire 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.