This product is the 'Joker Slider' from JJEDC. Unlike other sliders that focus on vibration feedback, this slider is designed for fancy play.
The outer shell is made of ABS material, and the base plate is made of 316L stainless steel.
Dimensions: Width 28mm, Length 46mm, Thickness 14mm
The design with strong magnets at the four corners and a weak magnet in the center makes it easier to perform tricks using the four corners. Two stainless steel base plates, one flat and the other with a slightly raised center, further reduce pushing resistance.

Default magnet layout diagram


The base plate structure uses a retainer mounted on a stainless steel channel to hold the magnets in place. This design allows for easy replacement of the retainer when the authors develop new designs in the future.
The side with eight magnets has four brass counterweights, which can be added or removed to adjust the weight to your liking.
My feedback after playing with it for a few days: Unlike some fully magnetic sliders with strong magnetic feedback, this product focuses on practicing fancy tricks. The overall magnetic feedback is relatively weaker, but the overall smoothness of pushing is greatly improved. The slight bulge in the middle of one side of the base plate and the strong magnets at the four corners make it easy to complete some difficult tricks.
Below are some fancy trick videos shared by JJEDC and his fans.