There are two holes on rotation wedge, nested the wedge on the bracket wing where on the dental crown convex labial facies. Only tie the ligature wing without hanging the wedge after nested the archwire. With the softy and elasticity of the rotation wedge to aline the teeth. Especially for twisting the incisors.  But not suitable for the big rotation angle incisors.

 10 rings/stick, 20 ties/bag