柞蚕糸 Sakusanshi is tussar silk.

Tussar silk is made from silkworms that eat leaves other than mulberry (sawtooth oak, oak, chestnut, horse chestnut, beech, etc.). Unlike pure silk from silkworms that only eat mulberry, it is not pliant and shrinks when heated.

However, now that natural materials are being reconsidered, rusticity, hardness of thread, lightness, and unique luster characteristics in yarn that are gaining attention.

Material: Silk 100%

Weight: approx. 100 grams ( 3.5 oz )
Length: approx. yards ( m )
Color: Slightly yellowish natural white
Use: Knitting, Weft

Yarn weight:
Knitting needle size: 4mm - 6mm
Weaving reed size: 5 dents per cm
Form: Skein
Lot:

Cotton origin: China
Manufacture: Japan