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Now available the Topre Realforce 104UBS (Silent) keyboard, in USA layout, is a joy to type on. It incorporates Topre's patented 30 million key life cycle non-contact electrostatic capacitance switches, with additional sound dampening on the upstroke. The switch weight has been adjusted across the width of the keyboard depending on their relative positions and usage (55gm, 45gm & 30gm +- 15gm), to minimize fatigue for users, even after extended use, and are highly durable.