What is the difference between 8 mm or 10 mm slingshots made of stainless steel?

Each has his own merits. Relatively speaking, an 8mm rubber band has a longer life and is less prone to injury. 10mm is relatively heavy, so you can use a heavy bow rubber band above 1745, which is not easy to shake hands and relatively stable.

Slingshot is a cold weapon or a game tool. Slingshot is generally made of branches in the shape of a "ya", with epithelial tendons at both ends of the upper end and skin blocks wrapped around the body in the middle. Strength depends on the tension of the rubber band. The greater the tension of the rubber band, the greater the power of the slingshot. A long-range weapon that fires projectiles with a bow. In ancient times, projectiles were mostly used for hunting.