How big steel ball for flat leather slingshot

30mm. Flat skin slingshot relative to the traditional slingshot, more suitable for novices, more simple, fast progress, stable, and flat skin tension light, children and the elderly can easily pull open, do not feel the effort, although the tension is light, penetration is not weak than the traditional slingshot, but over. Flat leather slingshot 30 mm steel ball, forehand push bow horizontal grip, horizontal on the ground, slightly off the head, the back hand pull to the eyes below, close the other eye, at this time in your eyes the two bands re-synthesized into a line, the top of the above bands as a reference to the aiming point aligned with the target.