than the strip 9 of the fig2 embodiment the embodiment 12 39 thus illustrates the fact that considerable variation is possible relative to the size and the shape of the cushioning strip fig4 shows yet another embodiment 112 having a plurality of cushioning strips 9 and 19 placed in different locations in both cases it will be understood that the cushioning strip is located in a zone where contact between adjacent slats normally occurs and in which such contact in a conventional slat will produce a clattering noise it will be understood that while the tambour slat 112 of fig4 shows two such cushioning strips a fewer number or a greater number can be used for example it is entirely feasible to eliminate the cushioning strip 9 and rely solely on the cushioning strip 19 or vice versa fig5 shows yet another embodiment 212 wherein the cushioning strips 39 49 and 59 are each provided as an additional thickness this construction also being formed by dual durometer co extrusion while the cushioning strips 39 and 49 are generally in the same location respectively as the cushioning strips 9 and 19 in the embodiment of fig4 it will be seen that cushioning strip 59 is provided in a different location again the location of the cushioning strip depends on design and functional considerations.