40 Percent is Best Percent : r/MechanicalKeyboards
IC] Let's Tango (Split 40% Ortho) - Final Update - On Sale Now!
Dygma Raise review: splitting the difference between gaming and ergonomics - The Verge
Amazon.com: 40 Percent Mini Gaming Keyboard, 42 Keys Fully Programmable Keyboard with 16 Macro Keys, High Ground Mechanical Keyboard with RGB Backlight, USB-C Compact Hot-Swappable Keyboard for Windows/Mac/PC : Video Games