Dusters Killer Ostrich Feather Dusters MB03, 28" L, Large

Where is this product made?

How long are the feathers? Are they black or gray? Need feathers 8" to 10" (10" preferably) for window shades.

How does this compare to a microfiber or Swiffer duster?

There are four different size dusters offered. Is the size difference just the handle length, or is the feather head larger on the larger dusters?