fact that the first and second sets of strands are inclined along directions that form a 45 u00b0 angle therebetween so as to form the open spaces as squares this change in the inclination angle between the first and second sets of strands may be advantageously achieved by changing the speed of rotation of the aforementioned extrusion dies it is also within the scope of this invention to not only change the rotary speed of the extrusion dies but to change the cross sectional area of the discharge orifice of the dies so that the cross section of the resultant extruded strands are variable as well in the case of the fig9 embodiment it is advantageous if the strands for the cylindrical end region 18 have a reduced cross section as compared to that of the strands in the central region 20 just as in the case of the embodiment of fig1 and 2 the user need only displace the movable end portions of end region 18 radially outwardly and downwardly toward the gathered stationary end portions at bunch 22 in order to form the crown like bow of fig1 the circular locus of the free ends of the movable end portions of axial end region 18 extends for a distance which is slightly less than said peripheral distance of the central region 20 in the fig9 embodiment so that the formed bow maintains its shape somewhat better than that disclosed in the fig2 embodiment turning next to the embodiment of fig1 13 a ball shaped decoration 74 is depicted in the bow formed condition the decoration 74 has the same netting as previously described and hence will not be repeated for the sake of brevity except to.