sites.google.com/view/spider-silk-structure/ ..... There are four types of silk available namely mulberry, taser, eri, and muga. However, the very high demand of silk for silk has led to a social pressure of searching for more options. The increasing demand for silk is not fulfilled by these four naturally available silk. So, the significant question here comes- Is there any difference source available for natural silk and the answer is yes. Spider Silk. It is very true that the ignored insect and the irritating can really produce a good fiber silk.