dome'lu membrane switch

...This type of membrane switch uses a metal dome as the upper circuit layer. When pressed, the center point of the metal dome will connect the lower circuit and then trigger a signal. The metal dome is typically made of stainless steel, which is flexible and can withstand over 1,000,000 presses. The metal shrapnel keys provide a good tactile feel and offer the operator excellent haptic feedback. HYS Electronics uses stainless steel shrapnel. (Switch'Air™ 4-legged domes) The most suitable metal dome for a true finger-pressing sensation is 10-12mm.