... , Flame Retardance, Abrasion Resistance and Smooth Surface KEYSTONE Flame Retardant Sewing Thread Supply High Mechanical Strength, Flame Retardance, Abrasion Resistance and Smooth ... . Constuction: 6-50Ne(Single Ply), 2-5 plies.3. Application: Glove, Bag, Mattress, Shoe, Uniform, Filter bag, etc4. Package: Sewing Thread Cone+Poly ...