This is silk mohair yarn from Norwegian yarn manufacturer Sandnes Garn.
Tynn Silk Mohair is a sheer version of Silk Mohair, a soft, luxurious yarn made from a blend of the finest mohair, wool, and silk. The yarn is thin and long-lasting. Knitting Tynn Silk Mohair in single or multiple strands creates a light, airy, and luxurious garmen