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HMEMC manufacture big size honeycomb vent core for US customer, all vent meet RoHS rules. Compare with other supplier low cost product, HMEMC vent do tin coating as surface processing, it will be more better than paint processing, it's long life time and good performance. It could meet 100dB@40G as 25mm thickness, other supplier meet the performance by 50mm thickness only. HMEMC vent is your best choice for RF shielding.