Slingshot leather band 0.55 with how big steel ball

Slingshot leather band 0.55 with 7mm steel ball. Slingshot is a kind of competitive games, by the light of the youth and middle-aged and old people's favorite, 0.55 leather band is generally with 7mm steel beads, it is simple to learn, easy to get started, like slingshot friends know that the different thickness of the leather band is suitable for different sizes of steel beads.