The Matias Quiet Tactile Switches are virtually identical to the classic simplified white Alps switches, with a similar force curve and activation force. However they are quieter and the lifespan of the Matias switches is longer, with 50,000,000 actuations (compared to the original spec of the classic white Alps, which was 10,000,000 actuations).
The Matias Quiet Tactile Switches are quieter than other mechanical keyboards, and have a sound level similar to a regular non-mechanical keyboard, they are quieter for two main reasons:
1) The switches have internal rubber sound dampeners, that drastically reduce the impact noise on the downstroke AND the upstroke.
2) The metal tactile leaf on the quiet switches is held stationary to eliminate the click noise. On the clicky switches, it's loose.

• Contact Mechanism: Metal Leaf
• Keycap Mount: Alps Mount
• Switch Mount: Plate Mount
• Activation Force: 60g ± 5g
• Life Span: 50,000,000 actuations