KEYSTONE Aramid Sewing Thread: 20S/3, 30S/2, 30S/3, 40S/3, 40S/4 KEYSTONE Flame Retardant Sewing Threads Supply High Mechanical Strength, Flame Retardance, Abrasion Resistance and Smooth Surface.1. Component: Meta-aramid, Para-aramid2. Constuction: 6-50Ne(Single Ply), 2-5 plies.3. Application: Glove, Bag, Mattress, Shoe, Uniform, Filter bag, etc4. Package: Sewing Thread Cone+Poly Cover