What type of key switches does the HHKB Professional Classic Type-S keyboard use?

It uses Topre Silent Capacitive Switches, which are known for their silent operation and comfort during extended use.

What is the actuation force of the keys on the HHKB Professional Classic Type-S keyboard?

The actuation force of the keys is 45g, which provides ultimate keying speed.

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HHKB Professional Classic Type-S Gaming Keyboard CG01000-399208, Compatible with PC and MAC, USB Type-C connection for wired, 2 Year Warranty, Snow

Best-in-class Topre Silent switches
45g actuation force for ultimate keying speed
Unique 60-key layout to save space and maximize efficiency
Ideal curvature keeps users’ hands and arms from getting tired, even during extended programming, coding, and keying sessions
Compact size and near-symmetrical layout make fingers feel comfortable staying on the ‘Home row’
Supports USB Type-C connection, no batteries required
Create personalized keymap with the Keymap Customization Function.
Three colors: white, charcoal, and snow, all with premium PBT keycaps
Dye-sublimation printed center-aligned legends for a sleeker aesthetic