This looks like a perfect stage illusion done in miniature. It even uses a method that is often associated with stage magic.

You display a small box with built in scissors and a tube down the center. You place your finger (or any similarly shaped object like a borrowed pen) into the tube from underneath so it protrudes from the top of the tube.

The scissors are then used to apparently cut through your finger and as a convincer you lift half the tube to show that the middle of the finger is completely gone even though the fingertip sticking out of the tube is still there and wiggling.

Everything is then restored, and your finger is back to the way it started. The finger is examinable but not the prop.

Comes complete with everything you need to perform the routine. This is a rerelease of the 1994 T-166 original Tenyo product. Manufactured by Tenyo Magic.