3D & 5D Premade Volume Fans Eyelash Extensions - When one lash of multiple lashes is applied to one single natural eyelash using very thin lashes. When these three or five eyelash extensions are applied to one natural eyelash, it’s described as 3D and 5D. This method is also known as Russian volume. The lash extensions used in this method are significantly thinner compared to the classic lash method, usually 0.07 in diameter. Volume lashes are lighter, and fluffier, and give the client a fuller look. Volume lashes are perfect for clients who don't have a lot of lashes, have sparse lashes, bald spots, or just want a more dramatic look without having to use a thicker lash.