Key Pads are made from a strong cloth-like stuff of fine wool. The pads close the holes airtight. The felt disks are covered with a fine membrane. The pads are covered over on the back side with little sheets of card and a hole is punched through the center, so that they may be screwed fast in the key cups.
Keyboard extension cables are designed to extend the length of any existing keyboard. It features molded connectors to provide shielding and strain relief.