In all transaxle yo-yos, ball bearings significantly reduce friction when the yo-yo is spinning, enabling longer and more complex tricks.

Subsequent yo-yoers used this ability to their advantage, creating new tricks that had not been possible with fixed-axle designs.

Other manufacturers replicate this with a similar inwardly curved surface, but use minor modifications.

In July 2014 some of the copies and parodies received copyright complaints from Yo, with Or Arbel saying "Yo has spawned many clones...

some of them are a complete replication of the Yo app...

In older (and some remaining inexpensive) yo-yo designs, the string is tied to the axle using a knot.

With this technique, the yo-yo just goes back-and-forth; it returns easily, but it is impossible to make it sleep.

The new version also enabled users to collect their friends in to groups so that they could "Yo" a number of people with 1 tap.

Since its release, Yo has been downloaded over 3 million times and over 100 million 'Yo's were sent.Many yo-yo tricks are done while the yo-yo is said to be sleeping.This is done by throwing a strong sleeper and allowing the yo-yo to roll across the floor, before tugging it back to the hand.The business started with a dozen handmade toys; by November 1929, Flores was operating two additional factories in Los Angeles and Hollywood, which altogether employed 600 workers and produced 300,000 units daily.The principal distinction between the Filipino design popularized by Flores and more primitive yo-yos is in the way the yo-yo is strung.A yo-yo (also spelled yoyo) is a toy consisting of an axle connected to two disks, and a string looped around the axle. A yo-yo is played by holding the free end of the string known as the handle (by inserting one finger—usually the middle or index finger—into a slip knot) allowing gravity (or the force of a throw and gravity) to spin the yo-yo and unwind the string (similar to how a pullstring works).