Eyelash extensions are typically made of synthetic materials or natural fibers like silk, mink, or human hair. The process of making eyelash extensions involves several steps:

1. The chosen material is first sterilized and prepared for use.

2. The extensions are then created by hand using either individual lashes or small clusters of lashes. They are often tapered at the ends to create a more natural appearance.

3. Once the extensions are made, they are carefully applied to the natural lashes using a semi-permanent glue that is safe for use near the eyes. The technician will use tweezers to carefully attach each extension to a single natural lash, making sure that they are applied evenly and with the proper separation.

4. The extensions are typically applied to the outer two-thirds of the natural lashes to create a more natural appearance and to prevent damage to the natural lashes.

5. The process usually takes between one and two hours to complete, and the extensions can last for several weeks with proper care and maintenance.

It is important to note that eyelash extensions should only be applied by a trained and licensed professional to ensure safety and to achieve the desired results.