I have two bundles of MueZart Eri Silk (cruelty-free) fiber; each lot is for 400 grams (each lot is broken down into 50g bags, measured for spinning up into yarn lots).  It's perfect for felting or spinning.  This is short-staple fiber, undyed, and natural.  Eri silk means that the worms/moths are not harmed/killed during its cultivation (unlike all other silk).