The first consideration is nervousness. If you are in the 4-strand rubber band group, quick recommendation: 18424, 25504, 17454, 20504, 20554, 30604 (from light to heavy); 8 mainstream rubber bands: 16328, 20408, 18428 (from light to heavy). There are other specifications of rubber band groups that are relatively rarely used.

Four or two are rubber band groups, and the traditional four-strand rubber band group consists of rubber bands with a length of 30 cm, which are folded and passed through the leather pocket holes to form a circle for use. The 8-strand rubber band group consists of two 30cm rubber bands folded on each side. The cocktail rubber band group consists of two kinds of rubber bands with different thicknesses. Near the skin is a thin rubber band, and near the arch is a thick rubber band, so that the center of gravity can move forward. It has a certain effect on improving the muzzle velocity of projectile when used.