Abstract: A pad for the key cups of wind musical instruments for use in selectively sealing tone holes and spit holes, comprising a plastic disc made up of two layers, one of which is suited for sealing the hole and the other of which is less stiff and carries a layer of contact adhesive and a release paper. The invention is used by forcing the disc into the key cup which causes the paper to take a set on the inside concavity of the key cup thus exposing an annulus of adhesive coated surface. This annulus sticks to the sides of the key cup to securely hold the pad in place while automatically correcting for minor misalignments and the like. The pad is preferably made slightly oversized with respect to the key cup diameter.