Cigalikes are either disposable or come with rechargeable batteries and replaceable nicotine cartridges. Many shoes have removable and replaceable footbeds. They have the original style removable/replaceable cylinder bushing. Single-use, disposable and replaceable cartridge models exist. For each type of replaceable blade, there is generally a disposable razor. Fortunately, DX maintained the DMX feature of use of removable/replaceable voice cards on EPROMs. The watch comes without a replaceable battery. Usually, the electricity is provided by a replaceable battery. The APX supports this with replaceable grip straps. It had a twin skin, incorporating an air retaining inner and a robust replaceable outer. Shanks are curved and have replaceable tips. Also, it had replaceable plastic lenses. The seat ring provides a stable, uniform and replaceable shut off surface. The idea is to build computers with easily replaceable parts that use standardized interfaces. Another effect of technology is a homogenous workforce that can be easily replaceable.