DjuiinoStar Heavy Duty Gyroscope (Solid Stainless Steel Rotor): Initial Speed 8,000 RPM, Sturdy and Stable; Provides Very Good Gaming Experience; High-End Office Toy, Addictive Science Gear DG-5PRO-01

It works and it's fun to mess with. Bought this as an office toy, but unfortunately it does tend to make a lot of noise. I get why, cause it's spinning really fast, but a bit too loud for the office.

Sure it costs more than you would expect, but this thing is well designed and well executed.The spindle turns on two tiny ball bearings. The disc is milled. The equatorial hoop of the frame is held in place by four tiny screws. Mine benefited from a little balancing, like you might do on a new fan. I used about 1sq CM of lead tape (for golf clubs). I divided the disc into 90 degree quarters and out the adhesive lead tape in one quadrant and spun the top. Then repeated for the remaining three quadrants. I picked the one quadrant that had the least vibration. Then doubled the weight which didn't help. Then halved the weight which also didn't improve vibration. So for me 1 CM square was best. One tiny drop of break free on each bearing.I spun it up and set on my mouse pad and it ran for 13 minutes and 33 seconds before coming to a stop.You could probably do a better job of balancing, but as it is its pretty amazing.

It still vibrates. This vibration makes the axis rotate onto itself much sooner, which stops much faster the fun than should actually be. Design looks great but has this flaw. Vibration kills.

One of the best gyroscopes I've ever used. I even made one myself in my mechanical engineering undergraduate program years ago, so I understand the precision and effort required to construct a good one. I cannot say for how long the gyro will spin, only because it spins for SO long that I always stop it short. I have yet to let it run its full course. Once you get the gyroscope spinning, you can really tell how powerful the rotor is. It's rotates fast, its heavy, and thus has a lot of angular momentum. Totally worth the price!

This is a great gyroscope! The mass of its wheel gives it tremendous spend time and great stability. Like all open caged gyroscopes this is prone to damage if dropped on a hard surface. I do not let my young grandchildren play with this because they do not have the dexterity needed to prevent dropping it. I use this and my other open gyroscopes on a plate. I don’t start the gyroscope very high above the plate so if it’s dropped, it doesn’t fall very far. When it lands on the plate, it usually keeps spinning and one can pick it up and set it back on its stand or other objects such as a pencil tip or a taught string. I like this gyroscope a lot!

The Good:- The metal disc is flawlessly produced, rotates perfectly evenly, and the ball bearings minimize friction- Looks greatThe Bad:- The thread is hard to pin point even wetted; you will have to cut off end pieces all the time to even have a chance to get the thread through one of the holes. Which means you need a scissor nearby all the time.- Leading the thread through the hole and making sure it doesn't slip back while trying to tightly wrap the thread around the axis is hard even for an adult- While the weight of the disk stores a lot of energy leading to a long rotation time (several minutes for sure, definitely longer than the cheaper models), it's almost impossible to spin this one to the RPM needed for the gyroscope to be simply stable on the provided (very solid!) stand, a thread, or a finger tip. After a dozen tries we have not even once managed to get it to that stage, which is disappointing - the axis always rotates to some extent- The idea of the two holes in the disk is good, but maybe they could be somewhat bigger, and/or provide holes in the axis as well as with the cheaper models- The included instructions are terrible and not very helpfulAll in all, we think this device is too expensive for the value provided. I had a cheap standard version of a gyroscope thirty years ago already, and it was more stable than this one (it just lost its energy faster)

worked as expected

This gyro is ok. It’s heavier than some which is good but the design of how to spin it up is not so good. They give you a sturdy string with the gyro, and plenty of it because you’re going to need it. Winding it and pulling it you to avoid the open 1/8 of an inch at the top or you will be spending the next day or two slowly picking the string out of this opening. Not to mention that if it happens to get caught in that opening as your trying to pull it as hard as it needs to be pulled to act as a gyro, the thing will be planted in the wall across the room and probably bent from the effort. Find one that has a much better spin up design. Trust me.