1 cone of spun polyester bobbin thread. The thread contains 12,000 yards of thread. The thread is a Tex 21 or approximately a 60 wt thead. This thread is a fine, strong bobbin thread. The finer the thread, the better your results are in your finished embroidery project. Spun polyester is stronger than cotton threads of equal size. It has excellent strength, very good chemical resistance, and very good abrasion resistance.