The magician brings a silk and waves it. The silk slowly turns to a ball with smoke in the air. The silk is free and independent in the performer’s hands! You can easily operate with one hand as smoke is generated by just pressing one switch while winding the silk. Diameter of ball: 49.7mm It comes with a ball, a silk, a charger and video instruction. Smoke liquid (the liquid in the “e-cigarette” that can be bought in stores) is not included.