effect taking advantage of the grommet strip for the additional damping of the frame made possible by the isolation of the grommet is an improvement not seen before in the prior art with such an extensible grommet strip having a damping layer attached and surrounding all the length of the head of the frame as shown in fig1 the racket frame will be the most damped frame possible to an extent not seen in the prior art in the art of damping layers for sports rackets of the type wherein a layer of damping material is applied to a racket frame with grommet stems extending therethrough the grommet stems are rigidly connected to and between frame layers or members so that the damping layer will not be able to provides its most efficient damping function if at all effective damping is thereby lost because the frame layers and the damping layer will vibrate together as a single thick beam as described above as can be seen from the above described computation by means of eq 2 the force f to move the stem depends on the width w the length h and the strip 39 s thickness t for a tennis racket frame using a plastic grommet strip for average.