From LivingPianos.

Magdalene Ho: Schumann Carnaval – https://youtu.be/NOPAIlWuUOE?si=RJRubinABxfS7xJx&t=1738

Athena: Narrow Keys Piano: https://www.narrowkeys.com/shop

DS Foundation – PASK: https://paskpiano.org/ds-standard-foundation/https://paskpiano.org/ds-standard-foundation/

Hailun – My Size Keys: https://www.hailun-pianos.com/my-size-keys

Stretto Pianos – Hannah Reimann: https://www.strettopianoconcerts.org/meet-the-team

Steingraeber & Söhne – Narrow Keyboards: https://www.steingraeber.de/en/innovationen/narrow-keyboards/

Reyburn Pianoworks: https://www.reyburnpianoworks.com/
David Rubenstein: http://www.pianosrubenstein.com/keys.html
Kaduk Musical Technology – Key Design: https://www.kaduk.nl/