100% poly poly core spun yarn 1.strength is 15%-20% 2.good core evenness,natural ... apparel,etc. From china factory, our 100% poly poly core spun yarn is made of special type of high tenacity polyester filament ... ;2) strength is 15% to 20%, higher than other spun polyester sewing threads;3) superior thread for high class apparel ... fashionable dress, suit-dress, etc. Ningbo 100% Poly Poly Core Spun Yarn