EMC Shield Cans Harwin EMC Shield Cans provide excellent RFI and EMI protection to sensitive circuitry at the PCB level when combined with SMT shield clips. The simple one-piece, five-sided design provides cost-effectiveness compared to complex fence-and-lid or through-board cans. Harwin EMC Shield Cans are made of nickel silver and available in heights of 5mm (0.3mm thickness), 2.5mm, and 3mm (0.15mm or 0.2mm thickness). An EMC Shield Can Kit is also available, which allows users to customize their own shield can during the prototyping and development phase.