PHYSICAL PROPERTIES OF SILK FIBER :
1.Normally, the dry silk fiber has a tenacity varying from 2.4 to 5.1 
grams per denier.Luster
The silk fiber's triangular cross-section gives it excellent light reflection.Shape and appearance
Silk filaments are approximately 900 - 1700 meters long.The diameter of the silk
filament is from 9 to 11 microns.Tenacity:
Silk fiber is extremely strong.A filament of silk is stronger than an equal diameter 
filament of steel.2.3.4.