The "drums" props are made of plastic, a drum membrane is installed at the top, and the decor is made of genuine leather. The drum membrane is decorated with UV printing. 
The puzzle is a set of 4 drums. An RGB LED strip and a knock sensor are installed in each drum. 
Each beat on the drum changes the color of its backlight. The correct combination of colors opens the external magnetic lock. 
All 4 drums are connected by a 2m long wire. 
The correct color combination is programmed using a special button. 
Drum size: diameter 45cm, height 14cm