shown new and improved means are provided for bonding the fastener strip 10 to a substrate 15 as shown in fig2 for this purpose the base 12 of the fastener strip is provided with a plurality of ribs 17 having spaces 18 therebetween in this instance four of the ribs 17 are depicted but there may be more or less of such ribs depending upon the size and possibly other characteristics of the fastener strip and the material from which it is made in the illustrated instance the ribs 17 are depicted as generally rectangular in cross section because that is an efficient form for extrusion but it will be understood that other geometric cross sectional shapes may be provided if desired for any particular reason in one preferred form as shown the ribs 17 may be about as wide as the spaces 18 and the height of the ribs may be slightly less than the width a principal consideration in determining the mass versus spacing relationship of the ribs 17 is that the ribs can be fused without significant transfer of fusion temperature to the fastener strip body 11 and when fused the ribs 17 can be shaped into bonding layer 19 between the fastener strip and the substrate 15 for maximum bonding strength of the layer 19 the fused ribs 17 merge into a substantially continuous bonding layer between the base surface 12 and the substrate 15 after the bonding a telltale evidence of the manner of bonding may be noted along the edges of the fastener strips 10 fig2 by slight lateral flow of the material of the fused ribs 17 along the edges of the strips compare fig2 with fig1 it will be understood of course that the.