The Bombyx mori usually produces silk thread of varying colors, ranging from light gold to very light green, with lengths varying from 500 to 1,500 yards per cocoon.
A single thread filament is too thin to use on its own, so Thai women combine many threads to produce a thicker, usable fiber. They do this by hand-reeling the threads onto a wooden spindle to produce a uniform strand of raw silk. The process is a tedious one as it takes nearly 40 hours to produce a half kilogram of Thai silk.
Many local operations use a reeling machine for this task, but the majority of most silk thread is still hand-reeled. The difference is that hand-reeled threads produce three grades of silk: two fine grades that are ideal for lightweight fabrics and a thick grade for heavier material.