1X(Color: transparent Material: Silicone Instructions e 1: Hardness: softer correct the pressure surface, use about , to adapt to the aligner and initial correction. Second e: Hardness: Moderate correct the , use 2-3 months, further adapt to the aligner, enhance the correction effect. The third e: hardness: harder consolidation and stereotype, use 3-6 months to increase the correction force for later correction and stereotypes. Package Included: 3 x Teeth Correctors)