Corespun polyester threads is a combination of filament polyester core thread wound in polyester. It is also called "Poly-core spun-poly", "P/P" and "PC/SP" threads. The advantage of using core spun polyester thread such as OMNI or OMNI-V is that the filament core increases the strength. The matte finish and strong tensile strength of OMNI and OMNI-V make them a favorite for sewing. Filament polyester is a continuous fiber thread. Some people hear the term filament and mistakenly think it is monofilament. The monofilament that looks like a fishing line is just one type of thin thread. It is a single (single) strand. MonoPoly is an example of monofilament thread. Other filaments are multiple filaments, consisting of two or three strands twisted together. This is the largest category of filament polyester. The multifilament strands are smooth and hairless, but opaque. The advantage of lint-free is that the machine is cleaner and less maintenance. The bottom ...