A bunch of silk is typically referred to as a "bundle" or "hank." In the context of silk thread or fabric, it can also be called a "skein." The specific term can vary depending on the form and usage of the silk.
HERD
resham
The Silk Road was a route not a road and it wasn't made of Silk either. You can always call it the Silk Route.
tuft
herd
flock
bunch
Bunch
silk
I would call a group of balloons a "bunch"
Herd or troop
A litter.