ゴム紐の事で困り事等がある場合は、何でも気軽に質問・ご相談ください。 Single covered yarn entails wrapping a single layer of masking yarn all around a Main yarn, usually spandex. This method leads to a yarn that provides moderate elasticity and power, which makes it appropriate for a variety of apps. 中の芯糸に天然ゴム糸やポリウレタン弾性糸などを使用すると横巻ゴムになり、芯糸に糸（伸び... https://aldousz851fgg9.tnpwiki.com/user