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。 One covered yarn includes wrapping a single layer of covering yarn all over a Main yarn, generally spandex. This process leads to a yarn that provides moderate elasticity and power, making it appropriate for several different programs. 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（... https://boysr346yph4.worldblogged.com/profile