Spun Muga ( as it is popularly called) is made up of spun tussar. Matka, however is made up of spun mulberry silk.
Spun muga is also popularly called as Moonga or Munga. It is known by 72/1 D in India. However it is actually 68Nm/1. It is obtained from Chinese tussar after spinning it on ring frame with a twist per meter of about 676.
Generally it is obtained in hanks.
It is not to be confused with Muga silk obtained from Assam region in India where the species is different.