One aspect of keyboard design that you'll often see mentioned in reviews—but about which most folks don't give a second thought—is the type of switches used for individual keys. You may not care about the specific mechanisms that reside beneath the keys, but you will feel the difference when typing. The three primary types are silicone dome switches, scissor switches, and mechanical switches. Most budget keyboards, such as those that come bundled with new desktops, use silicone-dome switches. These use two dimpled layers of silicone membrane that form a grid of rubber bubbles or domes as the springback for each key. The springiness of the silicone rubber makes for a soft, mushy feel as you press the keys. This switch type also requires you to "bottom out" with each keystroke, pressing the key to its fullest travel or bottom of the key well to type a letter. Because repeated flexing of the rubber membrane causes it to eventually break down, silicone dome switches lose their springiness and responsiveness over time. Some newer keyboards mimic the low-profile, chiclet-style keyboards found on full-size laptops and ultraportables. While a few of these use silicone-dome switches, many use scissor switches, which add a mechanical stabilizer to each key for a more uniform feel and an attached plunger under each keycap that allows shorter key travel. As a result, scissor-switch keyboards have a shallow typing feel but are generally more durable than rubber-dome switches alone.