Both are light, thin and soft, and while there's some debate about mink eyelashes and what they're made of, you might be surprised to learn that both are made of the same artificial material: PBT (polybutylene terephthalate). This means that the hair is likely to be a combination of normal hair and eyelashes. Even brands that claim that their eyelashes are made of human hair often mix mink or silk extensions. This is similar to when hair extension companies sell “mixed human hair extensions”.
Sure, half of the hair can be human, but the rest could be made of anything: horse hair, plastic, etc. These eyelashes are made of real human hair. They have a transparent band and are more comfortable than synthetic eyelashes. They're also a little thinner than mink eyelashes.
The main problem is that pure silk is too soft and cannot maintain the shape and curl that most customers want from their eyelash extensions. All eyelash extensions derived from animal hair or hair undergo ultraviolet sterilization procedures before being converted into eyelashes. Silk eyelash extensions usually contain several materials, such as silk, cashmere and derivatives of high-quality acrylic plastic. Human hair eyelashes are no different from human hair extensions: the materials used and the methods used to manufacture them are the same.
Whether human hair is used to create hair extensions, eyelash extensions, or adhesive false eyelashes, the effect is the same: supernatural. You'll probably see pop-up ads of all kinds, from cheap strappy eyelashes (the same quality you'd find at a drugstore) to high-end, diamond-encrusted eyelash extensions (believe it or not, they're real). When it comes to eyelash extensions, there are a lot of different types to choose from, so it shouldn't be surprising that there are also extensions made from human hair.