Abstract: The one piece rubber tying and fastening device comprising an endless band with an outer face located between two lateral faces, a knob and a neck portion connecting the said knob to the outer face of the endless band, the said knob having a substantially circular face and two intermediate faces connecting the said circular face to the neck portion, while the neck portion has two opposite side faces connecting the outer face of the endless band to the intermediate faces of the knob, whereby the intermediate faces in the neighborhood of the neck portion and the two side faces of the neck portion have a minimum bend radius of 0.5 mm.