The best to use for holding glue, pigment, ink, remover or lash primer during application of eyelash extensions and tattoo applications. Easy to clean and reuse again and makes the eyelash application much easier. Small size . The cup diameter is 0.5'' / 1.3 cm , and the finger round diameter is 0.7'' / 1.7cm . Simply put the ring on your less dominant hand & dispense a drop into the well.