Compared with other woodwind pads, cork pads are quite simple in that they are composed only of solid natural cork. Cork pads are often used with oboes, the upper joint in professional clarinets, and waterkeys for brass instruments and baritone saxophones. Cork pads come in the standard 3mm thickness but can easily be trimmed to the desired thickness. They are floated in with shellac or hot glue. The natural cork used in MusicMedic.com Cork Pads is with as little grain as possible to ensure a great seal against the tone hole.