0.018/0.022, 3 with hook/ 345with hook/without hookMaintenanceIn the daily maintenance , avoid sticky, hard and acidic food. In the process of use, brush up and down gently use soft toothbrush every day under the guidance of a doctor.Storage:stored in a room with a relative humidity of less than 80%, no corrosive gas and good ventilationFAQ:Q: Is that with arch wire together with bracket?A: No, it doesn’t have arch wire.