Multichrome flakies made of special material: the flakies in here are highly multichromatic (shift many colors), are metallic (chrome-like in finish) and are made of very thin sheets of metallic compounds (chromium compounds & aluminum) unlike all other flakies.
The 'chrome' in the name refers both to a metallic shine and the special material they are made of, unlike the term 'multichrome' when it refers to other colorshifting pigments.
Some nail polishes in this collection are also linear holographic. Holographic - forming a full rainbow all at once (a rainbow 'arc' is formed). This is in contrast to multichrome/colorshifting - one color becomes another if you turn your nails in another direction.