Material: this coloured macrame cord and string rope are made of natural cotton. It is very tightly, durable and good touch feeling. It has high tensile strength, low extensibility, and ensures better breathability Size: 100 yards/1.5 mm/19 colours optional. Great for macramé crafting projects. There may be a little bit deviation in the measurement of diameter. Please take the picture as a reference. No harmful dyes or chemicals. If this cord rope and string rope gets dirty it can go right in the washing machine, but be gentle, cotton can shrink. Widely used: this knitting cord rope and string rope are great for making different kind of macrame crafts, such as wall hangings, tapestry rope, dream catchers, Bohemia wedding arch decoration etc.