Convenient flexible cap

The utility model relates to a convenient flexible cap, the cap is curled by a plastic tape spiral and constitutes, the length of plastic tape is 25 -35cm, the width of plastic tape is 1.2 -1.8cm, the thickness of plastic tape is 0.8 -1.4mm, the middle part downward bulge of the cap that the spiral curls, the lower part central authorities of cap are equipped with the fixed orifices of diameter for 1mm, the circumference outside in the nib is cup jointed on the upper portion of cap. The utility model discloses a cap that the spiral curls can be adjusted to the nib of different specifications, has splendid commonality, can protect the refill through through -hole and oil absorption head, avoid the refill to damage, cap simple structure, not fragile, long service life, cost are extremely low, convenient to popularize and use.