Gutermann MARA 70 is a Tex 40 polyester thread built on MCT, or Micro Core Technology: a fine continuous filament core wrapped in staple fibre. That construction lets it be thin for its strength, so seams sit flat and neat without the bulk you'd expect from a thread this tough.
Tex 40 is the lighter of the two MARA weights we stock. It's
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Great thread, it runs very smoothly in my heavy duty Singer sewing machines, and makes the process much smoother overall.
