The Simplex is an iambic key with a heavy (1.4 kg) gold or palladium plated base and gold plated components, using long springs for the return force. Like the other Begali keys it is manufactured using NC machinery for absolute precision. Micro-threaded screws are used for all adjustments. The arms are held by 4 ball bearings that are imbedded in the base, and they are made of a light-weight alloy that provides very low moving mass – this allows excellent responsiveness at high speed even when set for a very light touch. The contacts are corrosion resistant and have been tested in salty fog according to DIN 50025. The key comes with a protective dust cover.