4A is perhaps one of the most striking styles of play. These type of Yo-Yos are characterized by being large, almost twice the regular Yo-Yo's size, but quiet, everything has its explanation.
4A Yo-Yos are not tied to the Yo-Yo string, which is therefore only tied to your finger. The rest is up to you. For a better understanding of this concept, 4A style is very similar to the game of diabolo.
By the way, do not fear dropping the Yo-Yo, such Yo-Yos are manufactured with a highly impactresistant plastic. Knowing this, you can start to innovate.