... :White, Black,Red,Orange,Yellow,Green,Blue,Purple. Size:0.7-1.5MM Thickmess of the nylon film:0.05-0.07MM ... as single and double springs of high level notebook, book, wall calendar and clips etc. They are characterized by smoothness-of ... :White, Black,Red,Orange,Yellow,Green,Blue,Purple.Size:0.7-1.5MMThickmess of the nylon film:0.05-0.07MMTensile Strength ...