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The material for the front cover is clear ABS, where the 3D carving pattern is created with the spray at the back, which is not possible with double injection. Ultrasonic wave adhesion method was used with consideration that the material is clear and when used with super glue, it would leave a stain or mark. This ultrasonic wave adhesion method leaves almost no mark and is also environmentally friendly. Above all its cost-effective unlike the double injection, so it offers a wide variety of designs.