（この画像の場合は、芯ゴムは、天然ゴム糸で、カバード糸は、上糸も下糸もポリエステル糸の生成色です。） Single covered yarn requires wrapping a single layer of masking yarn all-around a core yarn, commonly spandex. This process results in a yarn which offers reasonable elasticity and toughness, which makes it ideal for a variety of apps. Remember to consult your Health care company in th... https://devendrap875ygn3.nico-wiki.com/user