These tuning keys for all Salvi and Lyon and Healy tuning keys are covered with black rubber, which guards against any possible damage to the harp if they should fall when tuning.
This ergonomic model gives increased leverage and support to your wrist and arm.
These keys fit harps made by Thormahlen, and some of the other lever harp makers. If the tuning key that came with your harp has a thick, black rubber coating, then these keys should work for you!