out hookEdgewise, standard type/mini type, 0.018/0.022, 3 with hook/ 345with hook/without hookInstruction for useA: Clean tooth surface: use cup rubber wheel, dip in fine grinding powder to remove tooth tartar, color, rinse with water, blow air after alcohol drying, moisture-proof for acid corrosion, use mouth gag, pad cotton strip and saliva to prevent moisture.B: Acid Etching treatment of dental surface: coat with acid etching agent on the surface of tooth which need stick with ceramic bracket