Material: The hair coils are made of soft sturdy and durable thermoplastic polyurethane which no pungent smell and no metal, smooth and bright, comfortable to wear, and prevent hair tangling and breakage when use it..Size: The diameter of spiral traceless mix colors hair ties are 1.57inches/4.0cm, 2.0inch/5.1cm and 2.2cinch/5.6cm, but it can be stretched to longer size to fit any hair. After used for a long time, just simply soak it in a cup of warm water or use a hot blow dryer to make it recover its original size..Color: 15 transparent colors (mainly retro dark colors----7pairs + 1piece), 10 solid colors and 10 candy color hair coils,35 pcs hair coils are neatly arranged in a PVC plastic transparent box. Note: The size of 4.0cm coil hair ties is too small, it is not suitable for wearing on the wrist for a long time..Telephone Cord Spiral Design: They’re completely snag-free, the coil design grab your ponytail or bun into place rather than pulling it, so with no crease and no kink after used long time on your hair. The waterproof phone cord ring ties can be used in swimming but a traditional cloth hair ties can not..Apply to use: These Hair rings especially designed for voluminous hair holder when sports, gym, yoga, workout and other activities. Whether you are looking to match your blondes, brunettes, redheads black and any between colors, or just add a fun pop of color to your long,short,straight,thin,thick hair. DED has the best hair elastics for you.