Technical information: 1. Material: Spring steel 2. Surface treatment: Nickel plating 3. Process: Progressive Stamping---Nickel plating Engineering difficulty: 1. Good conductivity; 2. Easily welded; 3. Good elasticity. Remarks: 1. Tooling time: 14 working days 2. Production time: 13 working days 3. Usage: The power pack / HMI Components