This is the famous Sword Through Neck illusion, constructed in a neck tie. As a result, you have a sword apparently going through the bare neck without any shielding by a “frame” or “stock”. A clean and highly visual penetration effect, which you can perform on a large stage or even a drawing room, completely surrounded by the audience. Comes complete with special tie that makes this possible, stainless steel sword and scabbard.
Here is our friend Magic Crasher doing this:
The performer displays a sword, that can be demonstrated as rigid (swished in your most cavalier manner), and sharp (slicing pieces of a banana). A sporting, though reluctant assistant is coaxed into participating in the “experiment”. The sword is pushed right through the assistant’s neck and it visibly emerges at the opposite end. It is then pulled out again to show the assistant is unharmed.